FAQ

Nominal ventilation is defined according to DIN 1946-6 and refers to the required airflow of a ventilation system that should be achieved when users are present. This value ensures that there is sufficient fresh air supply to maintain air quality and remove moisture.

However, it is not necessary to operate nominal ventilation continuously whenever users are present. Instead, it can be activated as needed. The airflow for nominal ventilation must be individually calculated for each building, taking into account factors such as room size, air tightness, usage, and the number of people.

Only after determining the required airflow of a ventilation unit can technical values, such as sound levels and performance data, be specified.

Basic ventilation ensures the minimum air exchange rate required to maintain adequate air quality. It is usually operated continuously, even when no users are present, to prevent moisture damage, mold growth, and poor air quality.

Basic ventilation is especially important in modern, energy-efficient buildings with high air tightness, as there is little natural air exchange through leaks. Controlled basic ventilation ensures that pollutants, CO₂, and excess moisture are continuously removed.

Intensive ventilation refers to a higher airflow than nominal ventilation and is used when a particularly high air exchange is temporarily required. Typical applications include:

• Receiving guests to ensure a higher fresh air supply.
• Cooking or showering to quickly remove moisture and odors.
• Drying laundry to efficiently transport excess moisture.

This mode provides a rapid improvement in air quality but should not be used continuously to avoid unnecessary energy loss.

• Easy retrofitting – no complex ductwork required
• Individual room control
• Minimal installation effort & cost-efficient
• Energy savings through demand-based regulation

LUNOS offers highly efficient decentralized ventilation systems with heat recovery, making them ideal for renovations and retrofits.

• Easy retrofitting without duct systems
• Individual control for separate rooms
• Low investment & installation costs
• Flexible use in new buildings & renovations

While centralized systems are suitable for larger buildings, decentralized solutions offer optimal flexibility & efficiency for individual living areas.

Exhaust air systems remove stale air from moisture-prone areas (bathroom, kitchen, WC), creating continuous negative pressure that allows fresh air to flow in through window vents or other openings.

Supply air systems directly introduce filtered outdoor air into living and sleeping areas, often with heat recovery to minimize energy loss.

A combination of both systems ensures efficient air exchange.

Natural ventilation occurs through window openings, leaks, or shaft ventilation – but is uncontrolled and often leads to energy losses.

Controlled ventilation uses mechanical systems to regulate air exchange efficiently, often incorporating heat recovery.

In modern buildings, controlled ventilation is essential since high airtightness prevents natural air circulation.

• Normal ventilation (nominal ventilation) ensures air quality when people are present.
• Moisture protection ventilation operates at a lower level to prevent moisture damage & mold when no occupants are in the building.

Moisture protection ventilation is particularly important for unheated rooms, vacation homes, and well-sealed buildings where no natural air exchange occurs.

The air exchange rate indicates how often the entire room volume is replaced with fresh air per hour. It depends on several factors:

• Room size and volume
• Room usage (e.g., bedroom, kitchen, bathroom)
• Number of people in the room
• Moisture and pollutant levels

In living spaces, the typical air exchange rate is between 0.4 and 0.6 per hour. In bathrooms and kitchens, it can be higher to efficiently remove moisture and odors.

The required air exchange can be calculated based on the air exchange rate, considering legal requirements and the building's specific usage conditions. Specialists analyze:

• Room size and usage
• Number of occupants
• Air tightness of the building
• Possible moisture loads (e.g., from showering, cooking, drying laundry)

Based on these factors, the required airflow in cubic meters per hour (m³/h) is calculated to ensure optimal air quality.

Yes, fan-assisted ventilation systems can help save energy—especially if they are equipped with heat recovery.

• Energy savings through heat recovery:
  Systems with heat exchangers use the heat from exhaust air to preheat fresh air, reducing heating demand.
• Targeted control instead of window ventilation:
  Mechanical ventilation prevents unnecessary heat loss caused by uncontrolled window ventilation.
• Automatic demand-based control:
  Modern systems dynamically adjust ventilation to actual needs, avoiding unnecessary energy loss.

A demand-controlled ventilation system automatically detects various air parameters and dynamically adjusts the ventilation performance. Typical sensors measure:

• CO₂ concentration
• Humidity
• Temperature
• Volatile Organic Compounds (VOC)

If a critical threshold is exceeded, the system automatically increases the air exchange rate to improve indoor air quality. This saves energy since ventilation is only active when actually needed.

Mechanical ventilation systems offer many benefits:

• Controlled fresh air supply regardless of weather conditions.
• Automatic humidity reduction to prevent mold.
• Energy savings through heat recovery.
• Lower pollutant levels due to filtered fresh air.
• Reduced noise, as window ventilation is less necessary.

Especially in airtight, modern buildings, mechanical ventilation is essential to ensure a healthy indoor air quality.

Filter maintenance is crucial for efficient ventilation. LUNOS recommends:

• Standard filter replacement every 6 to 12 months
• More frequent replacement in high-pollution areas (e.g., urban environments)
• Regular filter cleaning to extend lifespan

A clogged filter reduces airflow, increases energy consumption, and negatively affects air quality.

The optimal ventilation frequency depends on room usage and the number of occupants:

• Living spaces: At least once per hour
• Bathrooms & kitchens: More frequent ventilation to remove moisture
• Bedrooms: Especially at night and in the morning for sufficient oxygen

Modern demand-controlled ventilation systems automate this process.

Yes, LUNOS fans are designed for intelligent, demand-controlled operation. The Silvento-EC is an example of a ventilation unit that, depending on the model, simultaneously measures:

• CO_₂ concentration
• Humidity
• Temperature
• VOC levels

It dynamically adjusts ventilation performance, optimizing air quality while saving energy.

Continuous ventilation is essential to ensure a consistent supply of fresh air and to prevent moisture buildup and pollutant accumulation in indoor spaces. This is especially crucial in airtight buildings, where natural air exchange is minimal. Without continuous ventilation, the following issues can arise:

• Increased CO₂ concentration (leading to fatigue and headaches)
• Moisture problems & mold growth
• Accumulation of pollutants & unpleasant odors

Mechanical ventilation systems help prevent these problems by automatically regulating air exchange.

Humidity affects indoor air quality and well-being:

• Excessive humidity (> 60%) can lead to mold growth and structural damage.
• Insufficient humidity (< 40%) irritates the respiratory tract and promotes the spread of pathogens.

A regulated ventilation system helps maintain humidity within the optimal range of 40–60%, protecting both health and building structures.

Heat recovery significantly reduces energy loss during ventilation. Instead of expelling warm indoor air, the heat from the exhaust air is used to preheat the incoming fresh air.

• Up to 90% energy savings
• Reduced heating demand in winter
• Enhanced living comfort through stable temperatures

Modern LUNOS ventilation systems integrate highly efficient heat exchangers to maximize this potential.

The noise level of a ventilation system depends on:

• Fan type & speed – Higher settings are louder than lower ones.
• Airflow & duct system – Poor duct routing can cause airflow noise.
• Structural integration – Sound-absorbing materials help reduce noise.

LUNOS relies on quiet fans that remain barely noticeable even at higher settings.

A smart home connection enables intelligent control of the ventilation system, offering:

• Automatic adjustment based on CO₂/humidity levels
• Remote control via apps or voice assistants
• Energy savings through demand-based regulation

Thanks to interfaces like KNX, EnOcean, or 0-10V, LUNOS systems can be integrated flexibly.

Yes! Ventilation systems with high-quality filters can:

• Filter pollen and fine dust from outdoor air
• Reduce mold spores
• Minimize house dust & mite exposure

LUNOS offers optional fine dust and pollen filters to optimize air quality, especially for allergy sufferers.

• Elevated CO_₂ levels (> 1000 ppm) can cause headaches, fatigue, and concentration issues.
• Optimal levels are below 800 ppm for a healthy indoor climate.

Sensor-based ventilation systems automatically adjust airflow to maintain ideal CO_₂ levels at all times.

Regular maintenance ensures that the ventilation system operates efficiently and maintains good air quality.

• Prevents contamination & bacterial growth in filters and ducts
• Maintains energy efficiency through clean heat exchangers
• Avoids performance losses due to dust accumulation
• Extends the lifespan of fan components

LUNOS recommends regular visual inspections, filter replacements, and cleaning of ventilation units at least once a year.

To save energy, the ventilation system should be demand-controlled:

• Automatic control via CO₂ and humidity sensors
• Activate heat recovery to save heating energy
• Use time-controlled operation modes to reduce performance at night or during absence
• Change filters regularly to minimize air resistance

Modern LUNOS devices dynamically adjust the airflow to ensure efficient and energy-saving operation.

Yes, mechanical ventilation systems ensure continuous odor removal, especially in:

• Kitchens (fumes, cooking smells)
• Bathrooms & toilets (humidity & unpleasant odors)
• Bedrooms & living areas (human emissions, pets)

Demand-based control and the use of activated carbon filters can effectively minimize disturbing odors.

The dew point is the temperature at which air moisture condenses.

• Condensation can lead to moisture damage & mold growth
• Modern ventilation systems prevent condensation by automatically regulating humidity

LUNOS ventilation devices with humidity and temperature sensors adjust the air exchange to prevent condensation & moisture damage.

Mold forms due to high humidity and insufficient air exchange.

• Continuous moisture removal prevents mold growth
• Automatic control via humidity sensors keeps levels in the optimal range
• Targeted exhaust air control in wet rooms reduces condensation
• Heat recovery minimizes cold bridges that encourage mold formation

LUNOS devices like the Silvento ec can automatically detect and remove moisture peaks to prevent mold.

Outdoor air can contain fine dust, allergens & pollutants, which may accumulate indoors:

• Fine dust & pollen – can trigger allergies
• Nitrogen oxides & VOCs – originate from traffic or building materials
• Mold spores & bacteria – can be harmful to health

LUNOS ventilation systems with fine dust & activated carbon filters reduce these pollutants and ensure clean, filtered indoor air.

A complete shutdown can lead to:

• Stagnant air quality (CO_₂, pollutants, and odors remain in the room)
• Moisture damage & mold formation
• Loss of heat recovery & energy efficiency

Instead, the ventilation should continue running in a reduced mode (moisture protection operation) to ensure minimum air exchange & building protection.

VOCs (volatile organic compounds) are gaseous pollutants released from furniture, paints, cleaning agents & building materials.

• High VOC concentrations can cause headaches, fatigue & respiratory irritation
• Proper ventilation reduces VOC exposure and improves air quality

LUNOS devices with VOC sensors detect harmful gas concentrations and automatically adjust ventilation as needed.

At LUNOS, we consider a residential ventilation system to be an intelligent system that ensures continuous air exchange in your home. Our systems automatically extract used, humid, and polluted indoor air and replace it with filtered fresh air, which may be preheated depending on the ventilation system – all without the need to open windows manually. Depending on the device, high-precision sensors measure parameters such as temperature, humidity, VOCs (odors), and CO₂ in real-time, determining the exact ventilation requirements. This ensures a consistently comfortable and healthy indoor climate, particularly benefiting allergy sufferers and people with respiratory conditions. Additionally, our systems efficiently remove excess moisture, reducing the risk of mold formation. Overall, our ventilation systems combine state-of-the-art technology with maximum comfort to help preserve the value of your property.

Modern buildings are increasingly constructed with airtight designs, minimizing natural air exchange through leaks. While this improves energy efficiency, it also neglects the need for fresh air supply. At LUNOS, we understand that without mechanical ventilation, used air, humidity, and pollutants can accumulate indoors. Our systems ensure a continuous supply of filtered fresh air, reliably optimizing the indoor climate regardless of user behavior. This not only prevents health issues but also provides long-term protection for the building structure. Additionally, by utilizing heat recovery technologies, energy consumption is optimized, as the heat contained in the exhaust air is used to preheat the incoming air. Thus, LUNOS ventilation offers an innovative solution for modern, energy-efficient buildings.

In a LUNOS system, outdoor air is first drawn in through a specialized intake system and always passes through at least one filter that removes coarse and fine particles. The filtered air is then preheated in a high-performance heat exchanger, depending on the device, before entering the rooms at a comfortable temperature. Simultaneously, used indoor air is extracted and, if applicable, directed outside via the heat exchanger. This separate treatment of supply and exhaust air ensures that pollutants and moisture are effectively removed while optimizing heating energy use. Our systems operate automatically, continuously adjusting air exchange based on current conditions—controlled by advanced sensors and, depending on the model, an intuitive user interface. The result is a demand-driven, continuous air exchange that ensures a healthy and comfortable indoor climate.

Heat recovery refers to the process in which the heat contained in the exhaust air is used to preheat the incoming outdoor air. At LUNOS, this technology is implemented using a highly efficient heat exchanger that transfers nearly all the thermal energy from the used air to the fresh air. This reduces the need for additional heating energy, lowering operating costs and reducing CO₂ emissions. Preheating ensures that the supply air enters at a comfortable temperature, significantly enhancing living comfort. This process is essential in modern, energy-efficient buildings designed to minimize heating demand. Overall, heat recovery is a fundamental component of our LUNOS systems, balancing sustainability and economic efficiency.

A LUNOS system consists of multiple integrated components that work together to create a seamless and efficient air exchange system. We have developed a hybrid ventilation concept, collaborating with planners, architects, and installers to design tailored ventilation solutions for each residential unit. Various devices can be combined, including passive air inlets (ALDs), exhaust systems, and advanced units with heat recovery. A key component is often the heat exchanger, which transfers heat from the exhaust air to the incoming air to save energy. This is complemented by an efficient filtration system that removes pollutants and particles from the air. An intelligent control system, managed by sensors, monitors and regulates the entire air exchange process. These components ensure a continuous, optimal, and hygienic air exchange.

At LUNOS, we offer both centralized and decentralized ventilation solutions tailored to different building structures and requirements. Centralized ventilation systems process all indoor air through a single central unit, distributing it via an extensive duct system to all rooms. Decentralized systems consist of individual, compact units typically mounted on or within exterior walls, making them particularly suitable for retrofitting and older buildings. While centralized systems require higher initial investments and a more complex installation process, decentralized units offer easy installation, flexibility, and individual control options. Both systems utilize advanced heat recovery technologies to optimize indoor air quality. The choice between centralized and decentralized ventilation depends on the building conditions and individual customer needs.

Our LUNOS systems introduce fresh air through specially designed supply air valves (ALDs) or heat recovery units (e.g., e²60), strategically positioned to ensure even distribution. These valves are often integrated into exterior walls, windows, or door areas to blend seamlessly into the room design. Before entering the rooms, the air is preheated via a heat exchanger, depending on the device, to ensure a comfortable temperature. Modern sensors determine the ventilation requirements of each room, adjusting the airflow accordingly to provide optimal air quality. Additionally, the interior covers of the units are designed to minimize noise and prevent uncomfortable drafts. Thus, LUNOS delivers a customized solution that enhances indoor air quality and energy efficiency.

In a LUNOS system, used indoor air is deliberately extracted and directed outside through a sophisticated system. Before being discharged, it typically passes through a heat exchanger, recovering a significant portion of its heat—an essential factor in reducing heating energy demand. Our systems strictly separate exhaust and supply air to ensure optimal hygiene and efficiency. The targeted removal of exhaust air prevents the accumulation of pollutants and moisture, maintaining superior air quality. This ensures that your indoor spaces are continuously supplied with fresh, healthy air.

One major advantage of LUNOS ventilation systems is their ability to continuously remove excess humidity from indoor spaces. Mold growth often results from condensation on cold surfaces when humid indoor air is not exchanged in time. By ensuring a demand-driven air exchange, our systems maintain optimal relative humidity levels, preventing condensation and mold formation. Additionally, high-quality filters remove mold spores and other particles from the incoming fresh air. A uniform air distribution throughout all rooms guarantees that even hard-to-reach areas receive adequate ventilation. Thus, the LUNOS system not only enhances health and well-being but also provides long-term protection for your building structure.

At LUNOS, air filtration is a key component of our ventilation systems, ensuring that only high-quality, low-pollutant air enters your home. Different filter types first remove coarse particles such as dust and dirt, followed by finer pollutants, pollen, and allergens. This significantly improves indoor air quality, reducing the risk of allergic reactions and respiratory diseases. A clean filter also prevents dirt buildup in the heat exchanger and air ducts, maintaining system efficiency. Regular maintenance and timely filter replacement are essential to ensure both air quality and long-term operational efficiency. Overall, air filtration helps ensure that you always enjoy fresh, healthy, and clean indoor air.

The total costs of a residential ventilation system consist of various factors, including both investment and operating costs. Investment costs include the purchase of the system, planning, and any necessary structural modifications, such as installing ducts or creating openings. The installation effort—especially for central systems—also plays a role, as extensive assembly work may be required. Additionally, ongoing costs include electricity consumption, regular maintenance, and filter replacements. Subsidies and tax benefits can significantly reduce these costs, making a thorough cost-effectiveness analysis essential. The entire life cycle must be considered to assess the long-term benefits and profitability of the investment.

Yes, investing in a LUNOS residential ventilation system with heat recovery pays off economically over time. Despite higher initial purchase and installation costs, the system amortizes itself through significant savings on heating costs, as pre-warmed fresh air greatly reduces energy demand. In the long run, you benefit from lower operating costs since the system operates very efficiently with minimal power consumption. Subsidies and tax incentives can further reduce the investment burden, allowing the system to pay for itself within a few years. Additionally, a modern ventilation system increases property value by ensuring a healthy and sustainable indoor climate. In summary, LUNOS technology offers not only health and comfort benefits but also an attractive economic perspective.

Yes, the installation of modern residential ventilation systems is supported by numerous subsidy programs. On a national level, institutions like the KfW Bank offer loans and grants for energy-efficient renovations and new constructions. Additionally, regional subsidy programs and grants from state ministries promote the use of sustainable ventilation technology. These subsidies aim to reduce energy consumption and CO₂ emissions, making an important contribution to climate protection. Tax benefits can further lower the investment costs.

The payback period of a LUNOS ventilation system is determined by comparing annual heating cost savings with the total investment costs. The heat exchanger significantly reduces heating energy consumption, directly leading to lower operating costs. Furthermore, the system’s low electricity consumption and long lifespan reduce ongoing expenses. Government grants and tax benefits can further decrease the initial investment, shortening the payback period. In many cases, the system pays for itself within a few years—often between 7 and 10 years—depending on building conditions and individual usage. Overall, LUNOS technology offers a long-term, economically viable solution that is both ecologically and financially beneficial.

A detailed ventilation concept is essential for new buildings and major renovations, particularly when significant improvements to the building envelope’s airtightness are made. At LUNOS, we recommend such a concept whenever more than one-third of the windows are replaced or significant sealing work is performed on the roof. The concept calculates the required air exchange and determines the optimal system design. It considers all relevant factors, such as room volume, usage patterns, and pollutant loads, to ensure a healthy indoor climate. Additionally, it documents compliance with legal standards and subsidy requirements. Overall, it provides a transparent and well-founded basis for the installation and operation of an energy-efficient residential ventilation system.

To calculate the required outdoor airflow, the living space area is multiplied by the room height to determine the total volume of the rooms to be ventilated. A minimum air exchange rate, typically between 0.3 and 0.5 h⁻¹, is then applied. The result of this multiplication indicates the required air exchange in cubic meters per hour. In practice, room-specific factors are also considered, such as higher requirements in humid areas or high-use spaces. Additional factors like the number of occupants or specific pollutant loads can further influence the final value. At LUNOS, we use modern planning tools and adhere to current standards to ensure precise and customized calculations.

Certain rooms require specific ventilation rates due to their use. Kitchens and kitchenettes generate high levels of moisture and odors, necessitating increased exhaust airflow—often 40 m³/h or more. Bathrooms, where frequent showering occurs, need intensive dehumidification to prevent mold growth. Windowless rooms, such as WC areas, require special ventilation solutions since they lack natural airflow. In living rooms and bedrooms, a balanced air exchange is crucial for maintaining comfort and an even temperature. LUNOS solutions accommodate these different requirements by enabling customized zone control.

A building’s airtightness is typically measured using a blower door test. This involves installing a powerful fan in an exterior door or window to create a defined negative or positive pressure inside the building. The test then measures how much air escapes through leaks in the building envelope, commonly expressed as the n₅₀ value. A low n₅₀ value indicates a well-sealed building, which is beneficial for energy efficiency but significantly reduces natural ventilation. This measurement provides crucial data for designing mechanical ventilation to precisely determine fresh air needs. At LUNOS, we use such measurements to tailor ventilation concepts precisely to each building.

Decentralized ventilation systems are installed directly in individual rooms and do not require an extensive duct network. At LUNOS, these systems enable flexible retrofitting, particularly in existing buildings where structural modifications should be minimized. Each unit typically operates independently and can be adjusted to the specific needs of each room—for example, through different ventilation levels or specialized filters. Installation is usually done on or within exterior walls, preserving the building’s aesthetics while ensuring optimal air exchange. Decentralized systems also offer the advantage of easy maintenance and quick replacement if needed. Overall, they provide a practical and cost-effective solution for achieving a modern indoor climate, even in older buildings.

Indoor air quality is a key factor in occupant comfort and health—an area that LUNOS prioritizes. Our systems continuously remove pollutants, dust, pollen, and excess humidity from the indoor air, ensuring a fresh and healthy indoor climate. Good air quality not only enhances general well-being but can also improve concentration and productivity. Additionally, it helps reduce allergic reactions and respiratory issues. Many countries have legal limits on indoor pollutant concentrations, which modern ventilation systems help to meet. Overall, high indoor air quality is a crucial benefit that enhances living comfort and preserves property value in the long term.

The installation of a LUNOS residential ventilation system is carried out by specialized professionals in heating, plumbing, and ventilation technology. These experts conduct all necessary on-site measurements and planning to integrate the system optimally into your building. They ensure that all components—from intake and exhaust ducts to the heat exchanger and control units—are properly installed and calibrated. Compliance with relevant standards, such as DIN 1946-6, is strictly observed. Additionally, our customer advisors train professionals on system operation and maintenance, ensuring long-term, trouble-free performance. In summary, professional installation guarantees efficiency, safety, and sustainability. We are happy to assist you in finding a qualified planner or installer in your area.

Various structural measures must be considered when installing a LUNOS system to ensure optimal and unobstructed operation. First, access points for the ventilation units must be created, such as through specific wall or ceiling openings, which should be properly sealed to prevent heat loss. The units must be installed in a way that avoids acoustic disturbances and ensures unobstructed airflow. Precise positioning of the supply and exhaust vents is crucial to ensure even air distribution throughout all rooms. All measures must comply with applicable energy regulations and standards. Ultimately, careful structural integration ensures that your system functions optimally and delivers the desired comfort and energy efficiency. A qualified contractor, with LUNOS support, handles the entire planning and execution for you.

Good indoor air quality is essential for our well-being, health and the protection of our buildings. Inadequate ventilation can lead to moisture damage, mold growth and poor air quality. In the past, gaps and cracks in windows and walls provided part of the ventilation. However, modern construction methods with tight building envelopes require targeted, mechanical ventilation.

DIN 1946-6:2019 is a key standard for planning and implementing the ventilation of homes and residential buildings. It defines when and how a ventilation measure is required and ensures that homes are supplied with fresh air even without conscious ventilation.

At LUNOS, we are guided by the highest technical standards - in particular DIN 1946-6 for the ventilation of apartments and DIN 18017-3 for internal exhaust air rooms. In addition, DIN V 18599 and international standards such as EN 12831 are also incorporated into our planning to ensure an energy-efficient design. These standards define the minimum requirements for air exchange, the dimensioning of ducts and the selection of components. They form the technical framework that ensures that our systems operate both efficiently and hygienically. Compliance with these standards guarantees that LUNOS products provide you with a future-proof and high-quality solution.

This standard deals with free and fan-assisted ventilation in residential buildings. It describes the planning, construction, commissioning and maintenance of ventilation systems and ensures that:

• Sufficient fresh air enters the home to ensure good air quality.
• Moisture is reliably removed to prevent structural damage and mold.
• Legal requirements and energy specifications are met.

A central point of the standard is the ventilation concept. This must always be drawn up if a home is built particularly tightly or if natural ventilation has been reduced due to modernization (e.g. window replacement). The aim is to ensure minimum ventilation for moisture protection.

A ventilation concept in accordance with DIN 1946-6 is required if:

• A new building is being constructed or a comprehensive modernization is being carried out.
• More than 1/3 of the windows in a building are replaced or a façade is renovated.
• The building has a high level of airtightness and therefore natural ventilation is not sufficient.

Such a ventilation concept helps building owners and developers to choose the optimum ventilation solution at an early stage - be it through decentralized exhaust air systems, mechanical ventilation with heat recovery or other solutions.

The standard distinguishes between different types of ventilation:

Free ventilation: Here, air is exchanged by natural pressure differences between indoor and outdoor air (e.g. through window ventilation or ventilation openings). This method is energy-efficient, but cannot be reliably controlled.

Fan-assisted ventilation: Mechanical ventilation systems use fans to ensure targeted air exchange. The standard distinguishes between:

Exhaust air systems: fans extract stale air (e.g. in the bathroom or kitchen), while fresh air flows in via outside air diffusers.

Supply air systems: Here, fresh air is actively blown into living spaces.

Supply/exhaust air systems with heat recovery: These systems ensure a continuous exchange of air by extracting stale air and using the heat from this air to preheat the fresh air. This saves heating costs.

Mechanical systems with heat recovery are the best choice, especially in modern, energy-efficient buildings.

The standard defines four ventilation levels, depending on requirements:

• Ventilation for moisture protection: ensures that no moisture damage occurs, even when no one is at home.
• Reduced ventilation: Reduced ventilation when only a few people are in the home.
• Nominal ventilation: Ventilation in normal residential operation with typical use.
• Intensive ventilation: High ventilation output for special requirements (e.g. after showering or cooking).

A well-planned ventilation system switches automatically between these levels, depending on humidity, CO₂ content or user behavior.

This standard is not legally binding, but is required as standard in many building regulations and funding programs. It helps to

• Avoid health problems caused by poor air quality.
• Prevent mold growth and moisture damage.
• Increase energy efficiency and living comfort.
• Create planning security for building owners, architects and installers.
• To make it easier to comply with building regulations and energy requirements.

• If you are building or renovating, you should have a ventilation concept drawn up in accordance with DIN 1946-6.
• If your building is very airtight, mechanical ventilation is the best choice.

If you want to save energy costs in the long term, a ventilation system with heat recovery is recommended.

An exhaust air system plays an essential role in removing odors, moisture and pollutants, resulting in a noticeable improvement in indoor air quality.

Unlike conventional ventilation systems, which merely circulate the air in the room, exhaust fans transport the stale air directly outside. This is particularly relevant in rooms with high levels of humidity or odors.

A distinction is made between central exhaust air systems, which serve several rooms simultaneously, and decentralized fans, which are designed for individual rooms such as bathrooms or kitchens.

Exhaust air ducts are used when direct air ducting to the outside is not possible. They direct the exhaust air to the outside and support controlled air exchange.

The volume of exhaust air fans can vary. However, modern appliances usually work very quietly. The manufacturer's decibel specifications help to identify particularly quiet models.

Yes, efficient exhaust air systems help to save energy by providing fresh air in a targeted manner and thus reducing the need for heating or cooling energy.

Maintenance includes regular cleaning of the fans and filters, checking exhaust air ducts for any blockages and maintaining the motors and control units.

The size of the room, the necessary air exchange, the structural conditions and personal preferences are important selection criteria. Professional advice is recommended.

Yes, smart extract air systems often allow remote control, programmable settings and integration into smart home systems, which makes it easier to control and adjust the ventilation.

In a LUNOS system, the used indoor air is extracted in a targeted manner and channelled outside via a sophisticated system. Before the exhaust air is discharged, it usually passes through a heat exchanger in which a large proportion of the heat it contains is recovered - a decisive contribution to reducing heating energy requirements. Our systems strictly separate the exhaust air from the supply air to ensure optimum hygiene and efficiency. The targeted extraction of exhaust air also prevents pollutants and moisture from remaining indoors and thus impairing the air quality. In this way, LUNOS ensures that your indoor spaces are always supplied with fresh, healthy air.

Outer wall air vents (ALD) are specially designed openings in the building envelope that enable a controlled supply of fresh air. At LUNOS, these vents are planned in such a way that they ensure the required air volume flow without causing disruptive draughts or noise. They are equipped with filters that remove dirt, dust and pollen from the incoming air. The dimensioning and positioning of the ALD is carried out in accordance with the applicable standards, such as DIN 1946-6, to ensure an optimum air supply. This targeted supply ensures sufficient air exchange even in very dense buildings. Overall, ALDs make a significant contribution to the efficient and hygienic operation of your LUNOS system. ALDs are usually only used in pure exhaust air systems. These devices are usually not used in systems with heat recovery.

In an exhaust air system, the air flows through a fan that transports the air from certain rooms such as kitchens, bathrooms and toilets to the outside. The fresh air then flows back into the home via outer openings. This is usually achieved by passive re-circulation, which is present in the other rooms.

The exhaust air systems are designed to create a slight negative pressure, which prevents moist air from penetrating the walls. This protects against structural damage and minimises the risk of mould growth. Heat recovery is also frequently used in modern exhaust air systems to increase energy efficiency by utilising the heat contained in the exhaust air to heat the supply air or feed the energy into the heating system. This is usually done using heat pumps, which absorb and transfer the energy from the exhaust air.

Heat recovery refers to the process in which the heat contained in the exhaust air is utilised to preheat the incoming fresh air. With LUNOS, this technology is realised by a highly efficient heat exchanger, for example, which transfers the thermal content of the stale air almost completely to the fresh air. This means that less additional heating energy is required, which not only lowers operating costs but also reduces CO₂ emissions. Preheating ensures that the supply air is at a pleasant temperature, which significantly increases living comfort. This process is essential in modern, energy-efficient buildings where heating requirements need to be minimised. Overall, heat recovery is a central component of our LUNOS systems, which harmonises sustainability and cost-effectiveness.

Typical heat recovery figures indicate what proportion of the heat energy contained in the exhaust air is transferred to the fresh air. In LUNOS systems, modern heat exchangers generally achieve heat recovery rates of 85 % to 90 %, with values of over 90 % even possible in particularly efficient systems. These high recovery rates are crucial for reducing heating energy requirements and at the same time achieving a comfortable indoor climate. The heat recovery rate depends on the design of the heat exchanger, the air velocity and the temperature difference. A high recovery coefficient is particularly important in energy-efficient buildings, where almost all the heat saved is used to preheat the supply air. In this way, we ensure that your LUNOS system is not only environmentally friendly, but also economical.

The efficiency of ventilation systems with heat recovery depends on several factors, including the type of heat exchanger, the insulation of the building and the way it is used. In general, these systems contribute significantly to energy savings by using the heat from the exhaust air to preheat the fresh air.

Our LUNOS systems with heat recovery are designed to significantly reduce heating energy requirements as they recover a large proportion of the heat contained in the exhaust air. Studies and practical experience show that savings of 25 % to 50 % in heating energy can be realised. This leads to significantly lower operating costs and more sustainable energy utilisation in your home. By efficiently preheating the incoming air, the heating system has to work less, which not only reduces energy consumption but also CO₂ emissions. This is a key aspect for LUNOS, as we not only want to minimise living comfort, but also the ecological footprint of our systems. Our technology therefore offers significant added value in terms of energy efficiency and sustainability.

The amount of maintenance required can vary depending on the system. In most cases, filters, heat exchangers and other components need to be checked regularly. Professional maintenance in accordance with the manufacturer's instructions ensures that the system works optimally.

Yes, these systems support humidity control through targeted ventilation and dehumidification. In this way, they help to prevent condensation and mold growth.

No, ventilation systems with heat recovery can also be installed in existing buildings, provided the building structure and technical requirements allow this. Careful planning and expert advice are essential here.

Modern systems are usually designed to be quiet, although the volume varies depending on the model. The sound power level provides an exact indication of the noise development of the respective model.

Yes, such systems improve indoor air quality by continuously supplying fresh air and filtering out pollutants such as dust, pollen and other contaminants.

Yes, at very low outside temperatures, efficiency can be affected as the fresh air may have to be additionally heated, which can reduce the heat exchange rate. Nevertheless, ventilation systems with heat recovery remain more efficient than simple ventilation systems, even in cold weather.

At LUNOS, we rely on various heat exchanger technologies, each of which is tailored to different requirements. Regenerative heat exchangers (also known as pendulum fans) store the heat in a medium and release it to the supply air in a second step. These different technologies are used at LUNOS depending on the situation in order to always ensure the best possible energy efficiency and an optimum indoor climate.

An enthalpy heat exchanger, e.g. installed in the Ne^xxt, differs from conventional heat exchangers in that it transfers not only the heat but also some of the moisture from the exhaust air to the fresh air. The system is based on a special membrane that enables the transfer of water vapour without the two air flows mixing. This prevents the incoming air from becoming too dry - a common problem with pure heat exchangers, especially in winter. At the same time, the recirculation of moisture ensures a balanced indoor climate, which increases living comfort. This technology is particularly advantageous in applications where both energy efficiency and a comfortable humidity level are important. LUNOS uses enthalpy heat exchangers in some units to achieve an optimum balance between heat and humidity recovery. However, it should be borne in mind that a unit with an enthalpy heat exchanger cannot achieve as high a dehumidification performance as a unit with other heat exchanger technologies. We currently see regenerative heat exchangers as having a clear advantage in comparison.

The heat exchanger in the e² ventilation unit, for example, works according to the principle of regenerative heat exchange. Here, the heat energy is stored and released in a cyclical process:

• Exhaust air cycle: Firstly, the warm, used air from the room is channelled through the heat exchanger. The heat from this air is stored in the heat exchanger.
• Supply air cycle: After around 60 seconds, the system switches to the supply air cycle. Fresh, cold outside air now flows through the heat exchanger, where it absorbs the previously stored heat. This preheats the fresh air before it is channelled into the room.
• Cyclical repetition: This process is repeated continuously, maximising energy efficiency by heating warm air in winter and cooling cool air in summer.

The LUNOS heat exchanger itself is made of a special ABS plastic that fulfils high hygiene and energy efficiency requirements and is certified in accordance with VDI 6022. The special technology of the (PbD) heat exchanger was developed and patented by LUNOS itself. We do not use standard ceramic heat exchangers here due to the improved CO₂ footprint and better efficiency.

The efficiency level of a heat exchanger indicates how effectively the heat contained in the exhaust air is transferred to the incoming fresh air. At LUNOS, we calculate this efficiency level as the ratio of the heat actually recovered to the maximum theoretically possible heat transfer, based on the temperature difference between the indoor and outdoor air. A high efficiency level - often between 85 % and over 90 % - means that almost all of the energy present in the exhaust air is utilised to preheat the supply air. This key figure is crucial for energy efficiency, as an efficient heat exchanger significantly reduces the heating requirement. Modern measuring methods, in which digital sensors continuously record temperature differences, ensure precise evaluation. Overall, efficiency level is a key indicator of the performance and sustainability of our ventilation systems.

The efficiency level of a heat exchanger is defined as the ratio of the heat energy actually transferred to the theoretically possible heat transfer. At LUNOS, we measure the temperature differences at the inlets and outlets of the heat exchanger for both the exhaust air and the supply air. Firstly, the maximum temperature difference between the warm exhaust air and the cold outside air that would theoretically be available is determined. Then the amount of heat that is actually transferred to the incoming air is measured. The quotient of these values, multiplied by 100, indicates the efficiency in per cent - modern systems often achieve values of 80 % to over 90 %. Modern digital sensors and data acquisition systems enable us to measure these values precisely and thus continuously optimise efficiency.

In passive houses, where insulation standards are particularly high and energy requirements are minimal, we favour the cross-flow heat exchanger. This technology often achieves recovery rates of over 80 %, meaning that almost all of the heat contained in the exhaust air is utilised to preheat the fresh air. The high efficiency is crucial for reducing the heating energy requirement in a very densely constructed building. In addition, the cross-flow heat exchanger operates in a completely separate system, ensuring reduced air mixing and constant air quality. The precise control and low power consumption make this heat exchanger ideal for passive houses. Overall, it ensures that maximum comfort and sustainable energy efficiency are achieved even with minimal energy consumption. In addition, our LUNOmat with integrated cross-flow heat exchanger is certified by the PHI (Passive House Institute) and has therefore been awarded the seal of approval for use in every passive house.

In our LUNOS systems, the heat exchanger is integrated centrally into the air flow circuit so that it processes both the extract air and the supply air efficiently. Depending on the appliance, the stale indoor air is channelled via the exhaust air ducts to the heat exchanger, where it releases its heat, while the cold outdoor air is simultaneously drawn in via separate ducts. This ensures that the fresh air is brought to a comfortable temperature before it enters the room. The separate routing of the air flows ensures that the two flows do not mix, but only interact thermally. Modern sensors monitor the condition of the air and control the heat exchanger automatically in order to achieve the best possible energy efficiency at all times. The heat exchanger is therefore a central element that reduces energy consumption while maximising comfort in your home. In regenerative ventilation systems (e.g. our e²60), the heat exchangers work on a slightly different principle and are even more efficient.

The use of heat exchangers presents a number of technical challenges that need to be carefully planned and monitored. One central problem is the formation of condensate: High humidity levels in the exhaust air can cause condensate to form, which must be removed efficiently to prevent damage and loss of performance. At very low outside temperatures, there is also a risk of condensate freezing and blocking the heat exchanger, which is why frost protection mechanisms are necessary. The pressure loss in the system must also be taken into account, as excessive resistance impairs the air flow and therefore reduces efficiency. Regular maintenance and cleaning are therefore essential to ensure that the heat exchanger functions optimally. Overall, the operation of modern heat exchangers requires careful coordination of all technical parameters to ensure maximum energy efficiency and reliability.

A heat exchanger makes a significant contribution to reducing heating energy requirements as it recovers a large proportion of the heat contained in the exhaust air. By preheating the incoming fresh air, your heating system has to use less additional energy, which leads to noticeable savings in operating costs. This recovery technology not only reduces energy consumption, but also CO₂ emissions, as less fossil fuel is required. At the same time, an efficient heat exchanger ensures a constant and pleasant indoor climate, as the temperature of the supply air is optimally adapted to requirements. Thanks to state-of-the-art technology and intelligent control, our systems are so energy-efficient that they pay off economically in the long term. All in all, a LUNOS heat exchanger combines environmental awareness with a high level of comfort and reduces your ecological footprint.

Yes, many LUNOS systems are designed so that the heat exchanger can also contribute to the indoor climate in summer. In summer (at night), a summer/night mode is often activated, which prevents the fresh air from being preheated excessively. This means that cool night air is channelled directly into the building to cool the rooms. The automatic control adapts flexibly to the external conditions so that the optimum mode is always selected - whether for preheating in winter or cooling in summer. In this way, LUNOS ensures that you can enjoy a pleasant indoor climate even in hot summer months without having to resort to energy-intensive air conditioning systems.

A heat exchanger primarily affects the temperature of the incoming air, but can also indirectly influence the relative humidity. If cold outside air is heated, its relative humidity drops, as warm air can absorb more water vapor than cold air. To prevent the room air from becoming too dry as a result, we integrate humidity recovery technology in many LUNOS systems, which recovers some of the moisture contained in the exhaust air. This mechanism ensures that the supply air is not only at a pleasant temperature, but also has a balanced moisture content. This creates a healthy indoor climate that is neither too dry nor too humid. Overall, this technology makes a significant contribution to promoting comfort and health in your home.

A LUNOS system consists of several integral components that together form a harmonious and efficient air exchange system. At LUNOS, we have developed the so-called hybrid ventilation concept. Together with specialist planners, architects and installers, we develop a customised concept for each flat and put together various ventilation units to create an ideal combination that precisely meets the needs of the users. Different devices can be used, from passive air inlets (ALDs) and exhaust air systems to complex devices with heat recovery, everything can be combined. The heat exchanger, which transfers the heat contained in the exhaust air to the incoming air in order to save energy, is usually at the centre of the system. This is supplemented by an efficient filter system that can remove pollutants and particles from the air. An intelligent control system, controlled by sensors, monitors and controls the entire air exchange process. Together, these components ensure that the system continuously realises an optimal and hygienic air exchange.

With heat recovery, the heat from the exhaust air is used to preheat the incoming fresh air. This increases energy efficiency and contributes to a pleasant indoor climate.

Hybrid ventilation systems are ideal for living spaces, offices and other areas that require demand-based ventilation and need to be operated in an energy-efficient manner at the same time.

Yes, both centralised and decentralised ventilation systems can be used in Multi-familiy houses, with both variants offering their specific advantages. Centralised systems (e.g. also an exhaust air system with a common main duct in the hybrid ventilation concept) process the air from all residential units in a common duct system and thus offer uniform control, which is particularly advantageous in new buildings. Decentralised systems allow individual control per residential unit, which is particularly advantageous in existing buildings or with different usage concepts. At LUNOS, we advise our customers on which system - centralised or decentralised - is best suited to the structural conditions and individual requirements. In the vast majority of cases, a so-called hybrid ventilation design is used, which was developed by LUNOS. Here, different devices are combined with each other in such a way that an optimum solution is created and the advantages of the respective systems can always be fully utilised. Both systems help to improve indoor air quality, reduce energy consumption and maintain the long-term value of the building. Overall, the use of modern ventilation technologies in Multi-family houses offers considerable added value in terms of comfort and energy efficiency.

They are usually controlled automatically by sensors that monitor parameters such as air quality and humidity. However, it is also possible to adjust the settings manually.

Yes, hybrid systems can be used in both new and existing buildings, as they can be flexibly adapted to different architectural and usage-specific requirements.

Air quality is of central importance. Sensors detect pollutants and CO₂ levels and adjust the ventilation to ensure healthy and pleasant indoor air.

Yes, many hybrid systems enable cooling in summer by using cool outside air, which can reduce the use of air conditioning systems.

Maintenance includes regular cleaning of the filters and checking the sensors. Some systems automatically inform you when maintenance is required.

Thanks to high energy efficiency and reduced operating costs, hybrid systems save costs in the long term and increase the value of the property thanks to their modern and sustainable design.

Sound insulation fans help to shield sources of noise such as traffic noise and at the same time ensure sufficient air circulation in the building, creating more pleasant room acoustics.

The construction method has a major influence on sound insulation performance. Our ventilation products are designed to provide effective noise reduction in both new and older buildings.

Sound insulation is a key factor in the planning of LUNOS ventilation systems, as disturbing noises can have a significant impact on living comfort. When selecting the fans and designing the ducts, we attach great importance to ensuring that these components operate particularly quietly. Silencers and sound-insulated housings are used to minimise the transmission of noise into living spaces. The positioning of the inlets and outlets is planned in such a way that potential sources of noise - for example in sleeping or living areas - are avoided. Precise control and intelligent regulation also ensure that the noise level always remains low, even at higher air volume flows. All in all, LUNOS guarantees that your ventilation system operates almost silently and significantly improves acoustic comfort in the home.

Yes, LUNOS ventilation systems are designed to significantly reduce the noise level in the house. The controlled and targeted air exchange means that windows can remain closed, preventing disturbing outside noises from entering the rooms. We also use low-noise fans, sound-insulated ducts and integrated silencers to keep the operating noise level as low as possible. Careful positioning of the inlets and outlets also ensures that the sound generated does not penetrate into sensitive areas such as bedrooms or living rooms. These measures ensure very quiet operation, which significantly improves living comfort. You benefit from a quiet, relaxed indoor climate without having to compromise on air quality.

With our design tool, the standard sound levels can be calculated depending on the system configuration and the structural conditions in order to optimally adapt the sound insulation performance of the ventilation.

Models such as the e²60 and LUNOtherm S+ are characterized by particularly high sound insulation values and are ideal for rooms that place high demands on quiet and comfort.

LUNOS soundproof ventilators not only reduce external noise, but also minimize the operating noise of the ventilation system, which contributes to a quieter living and working atmosphere overall.

To maximise living comfort, we at LUNOS attach great importance to ensuring that our ventilation systems operate particularly quietly. The latest technologies are used to minimise the noise level - for example through the use of low-noise fans and optimised air flow guides. Silencers and sound-insulated housings are an integral part of our systems so that disruptive operating noises are barely perceptible. Intelligent control systems ensure that the system operates particularly gently and quietly when demand is low. Digital networking enables potential sources of noise to be recognised and eliminated at an early stage. Overall, this focus on low noise levels offers a virtually silent operating experience that significantly increases living comfort in every room.

Digital controls (such as our 5/SC-RF) play a crucial role in modern ventilation systems by enabling precise and flexible control of air exchange. By using digital controls, various parameters such as air volume flows, temperature and humidity can be monitored and adjusted in real time. This is usually done using sensors that continuously record data and transmit it to the control system.

A major advantage of digital control systems is the possibility of automation. The control systems can be programmed to react automatically to changes in the ambient conditions. For example, the ventilation system can increase the air supply when the CO₂ concentration in a room increases or reduce the ventilation when the presence of people in the room decreases. This leads to optimised use of energy, as the systems are only active when necessary.

In addition, digital controls enable easy integration into smart home systems. Users can control and customise their ventilation systems remotely via mobile apps or central control units. This significantly increases convenience and user-friendliness. Digital controls can also be used for remote monitoring and diagnostics, which enables proactive maintenance and minimises downtime.

Another aspect is the ability to store and analyse data. Digital control systems can collect historical data that can be used to optimise operation. This data helps to identify patterns in user behaviour or environmental conditions, which in turn can help to improve efficiency and comfort.

Overall, digital controls make modern ventilation systems more flexible, efficient and user-friendly, resulting in better air quality and a more comfortable indoor climate.

Integration is achieved via special modules and controllers that can be directly attached to the LUNOS devices to enable seamless communication with the smart home gateway. These modules expand the functionality of the ventilation systems and allow for control through various smart home protocols, both wired and wireless.

Depending on system requirements, different interfaces and modules are available, including EnOcean radio modules for wireless integration, RS232 interfaces for serial connections, and KNX-compatible controllers for direct connection to KNX building automation systems.

Through these expansion modules, LUNOS devices can be integrated into existing smart home ecosystems and linked with additional sensors and actuators. For example, fan speeds can be automatically adjusted based on sensor values such as air quality, humidity, or temperature.

Additionally, the attachable modules enable control via central smart home platforms like Homee, allowing users to regulate their ventilation systems conveniently via an app, voice control, or automated scenes, ensuring optimal air quality and energy efficiency.

Yes, a LUNOS device can be used in combination with third-party smart home systems. Since LUNOS develops all interfaces themselves, they can often make customized adjustments and offer various integration options to ensure optimal adaptation to existing building automation systems and individual needs. These include, among others:

• KNX-control4: This is an installation variant for integration into distribution boxes or flush-mounted installations.

• KNX-control4-REG: A variant for mounting on a DIN rail in the electrical distribution. These controllers enable seamless communication with the KNX bus and precise control of ventilation devices.

• Plug modules for integration into homee systems: By combining the Brain Cube and EnOcean Cube from Homee, LUNOS devices can be controlled wirelessly and integrated into automation scenarios. Control is conveniently done via the associated app without subscription models.

• 0-10V interfaces for flexible control: Many LUNOS devices have analog 0-10V inputs, which allow control by external actuators. This enables demand-based regulation of fan performance and integration into automation solutions.

• Digital interfaces like RS232 and others: Through RS232 or other digital interfaces, LUNOS devices can be directly integrated into existing control systems and linked with additional components, such as sensors or automation software.

LUNOS offers specialized controllers that can be directly connected to an existing KNX system, enabling seamless integration. These controllers allow for bidirectional communication between LUNOS ventilation systems and the KNX bus, enabling centralized control and automation of ventilation functions within the smart home system. These options include, among others:

• KNX-control4: A compact installation variant ideal for installation in distribution boxes or in-wall enclosures.
• KNX-control4-REG: A rail-mounted variant for direct installation in electrical distribution panels.

These controllers allow operational modes, fan speeds, and sensor data, such as temperature or humidity, to be directly read and controlled through the KNX system. Users can flexibly adjust the ventilation, either manually via a KNX panel or automatically through predefined scenarios.

• Intelligent indoor air control: LUNOS devices can be paired with KNX sensors for CO₂, humidity, or temperature to adjust fan performance as needed.
• Energy-efficient control: The ventilation can be linked to heating, cooling, or shading systems to maximize energy savings.
• Scene and time control: Ventilation levels can be adjusted according to times of day, presence, or other building automation scenarios.

Thanks to the open KNX interface, LUNOS devices can be easily integrated into both existing and new smart home environments. Centralized control through the KNX system not only enhances living comfort but also contributes to efficient energy use and improved indoor air quality.

The integration is achieved by combining the Brain Cube and EnOcean Cube from Homee. The Brain Cube processes all signals and connects to the local network via Wi-Fi, while the EnOcean Cube enables communication with LUNOS radio modules. This allows for a wireless and flexible connection of LUNOS ventilation systems to the smart home system. Through the associated free app (without subscription models), users can conveniently control the connected devices, integrate them into automations or scenes, and view various system states in real time. For example, fan speeds can be individually adjusted, schedules for demand-based ventilation can be created, or sensor values like humidity and temperature can be monitored. The combination of the Brain Cube and EnOcean Cube also ensures seamless integration into an existing smart home ecosystem, ensuring intelligent and energy-efficient control of indoor ventilation.

These controllers enable demand-based and automated regulation of ventilation based on environmental conditions:

• Automatic mode: The ventilation automatically adjusts to temperature, humidity, and air quality values without the need for manual control.
• Sensor-based control: Integrated CO₂ and VOC sensors detect air pollutants and adjust ventilation to improve indoor air quality.
• Humidity and temperature management: Automatic adjustment of ventilation to prevent mold growth and optimize the indoor climate.
• Time control: Individual schedules for fan speeds, adjusted to times of day or usage profiles, as well as delayed demand or basic ventilation and after-run options.
• Smart home integration: Interfaces enable integration into various smart home systems for centralized control and automation.

Depending on the device and controller, there are further integration options, including KNX, EnOcean, RS232, and 0-10V interfaces. This variety of control options ensures that LUNOS devices can be flexibly integrated into both existing and new smart home environments.

Yes, LUNOS ventilation systems offer comprehensive remote control options that can give you access to the system status at any time via mobile apps and web-based dashboards. This remote control allows you to monitor measured values such as air volume flow, temperature, humidity and CO₂ in real time. You can also adjust individual settings, set time programmes and even view the filter status. Digital networking ensures that several systems can also be controlled centrally, which is particularly advantageous in larger buildings. This means you are always flexible and can react quickly to changes without having to be on site. Overall, this remote control offers a high level of operating convenience and contributes to the efficient management and optimisation of your indoor climate. KNX-based systems or an APP control system from homee can be used as examples.

Yes, LUNOS integrates modern smart home technologies that make it possible to control the ventilation system by voice command. Our systems are optionally compatible (e.g. via our EO modules in combination with a homee gateway) with common platforms such as Amazon Alexa and Google Assistant, so that you can query the operating status or make settings without having to intervene manually. These voice-controlled functions significantly increase ease of use and enable intuitive control, which is particularly appreciated in modern, digitally networked households. Integration into your smart home system also allows other components, such as lighting and heating, to be controlled synchronously, enhancing the overall impression of a smart, connected home. Overall, this technology ensures that your Lunos system is even easier and more convenient to operate.

An analog 0-10V input on LUNOS devices enables communication with smart home solutions by using an actuator within the smart home system that can output 0-10V. This allows for flexible control of various operational modes and fan speeds of LUNOS devices through the smart home system. The voltage signals from the actuator are interpreted by the LUNOS device, allowing for precise adjustment of fan performance according to individual needs or automated scenarios. This enables efficient regulation of indoor air quality, demand-based adjustments to temperature and humidity values, and integration into complex smart home automations, such as schedules or event-driven processes.

The FM-EO module enables wireless control of LUNOS devices and communicates with external controllers, sensors, relays, or radio switches without requiring additional wiring. This allows for flexible and easy integration of ventilation control into existing buildings without the need for complex installation work.

The module operates with the EnOcean wireless standard, an energy-efficient and low-maintenance communication protocol specifically designed for smart building automation. It can be connected to a variety of EnOcean-compatible controllers or additional modules. This allows for automatic and demand-based control of ventilation, such as based on air quality, presence, or time of day.

Additionally, the FM-EO module can be integrated into smart home systems like Homee, enabling centralized and convenient control via an app or voice assistants. The wireless connection not only provides high flexibility for retrofitting but also contributes to energy savings and improved indoor air quality.

Yes, RS232 interfaces are available on most LUNOS controllers and devices, facilitating integration into various systems. This serial interface allows for direct, stable, and reliable communication between LUNOS devices and external control systems, such as building automation solutions, smart home hubs, or custom-programmable controllers.

With the RS232 interface, control commands can be sent, and operational states can be queried, allowing precise adjustment of fan performance or automatic regulation based on external sensor data. It also allows for integration into higher-level systems, such as synchronized control with heating, cooling, or alarm systems.

Since RS232 is a widely used industry standard, users benefit from high compatibility with various automation solutions without being dependent on proprietary systems. This facilitates integration into existing infrastructures and the development of custom control concepts.

LUNOS offers open interfaces that enable easy integration into various smart home systems, including both analog and digital communication pathways. These interfaces provide high flexibility in connecting to different automation and control systems, allowing users to customize their ventilation solutions and integrate them into existing smart home environments.

Among the analog interfaces is the 0-10V input, which allows LUNOS devices to be connected to external actuators and controllers. This allows precise regulation of ventilation performance based on sensor values such as air quality, humidity, or temperature.

In the digital domain, LUNOS offers control via RS232 interfaces as well as integration into wireless communication protocols like EnOcean. This allows LUNOS devices to be integrated into smart home systems either wired or wirelessly, which is particularly advantageous for retrofitting or existing buildings.

Thanks to these open interfaces, LUNOS ventilation systems can be connected to KNX, Homee, and other automation solutions, enabling centralized control and monitoring of operational modes, fan speeds, and sensor values. This enables intelligent and energy-efficient control of indoor ventilation, contributing to improved living comfort and optimized energy savings.

LUNOS offers specialized controllers that can be directly connected to KNX systems to ensure efficient and intelligent control of ventilation units. The KNX integration allows the ventilation systems to be seamlessly incorporated into building automation and controlled centrally through the KNX bus system.

• KNX-control4 is a compact installation variant that is ideal for integration into distribution boxes or other in-wall installations.
• KNX-control4-REG is a version designed for direct mounting on a DIN rail in a control cabinet, making it particularly suitable for central installations in electrical distribution.

Both controllers enable precise adjustment of fan speeds and demand-driven regulation based on sensor values such as air quality, humidity, or temperature. For example, the ventilation can be automatically increased when elevated CO₂ levels are detected, or reduced when no presence is detected in the room.

Additionally, LUNOS ventilation systems can be interconnected with other smart components through the KNX system, such as heating, cooling, or shading systems. This contributes to optimized energy efficiency by synchronizing the ventilation with room temperature and other environmental conditions.

Thanks to open interfaces and standardized KNX communication, the controllers can be flexibly integrated into new or existing smart home systems. Users benefit from central control via KNX panels, visualization software, or mobile apps, enhancing comfort and ensuring optimal air quality.

The networking of LUNOS ventilation systems is driven by the use of modern IoT technologies and digital control systems. All parameters such as air quality, temperature, humidity and filter status can be monitored in real time via cloud-based platforms. This data enables the system to be optimally controlled and adjustments to be made remotely if necessary. Integration into existing smart home systems enables centralised monitoring and control of multiple systems in a building. Automated maintenance alarms and diagnostic functions also help to ensure that potential faults can be recognised and rectified at an early stage. Overall, this digital networking ensures that your system can always be operated in an efficient, user-friendly and future-proof manner.

To centrally control various LUNOS ventilation devices in a single smart home system, you can use a smart home control center or gateway that is compatible with the LUNOS devices. LUNOS offers interfaces such as KNX, EnOcean and RS232, which enable easy integration.

After installing the LUNOS devices and connecting them to the smart home gateway, you can use the associated app to manage all devices centrally. In the app, you can create scenarios that control multiple ventilation devices simultaneously, for example by adjusting fan levels or activating automatic modes based on sensor values.

In addition, you can set schedules that synchronize ventilation in different rooms to ensure consistent air quality throughout the building.

LUNOS does not offer its own smart home solutions in the sense of a complete, proprietary system, but instead focuses on integrating its ventilation units into existing smart home environments. This means that LUNOS products are designed to communicate seamlessly with other smart home technologies and systems to enable comprehensive automation and control.

• Flexibility and adaptability: By supporting open standards such as KNX and EnOcean, LUNOS allows users to flexibly integrate their ventilation systems into a variety of smart home environments. This gives users the freedom to choose the smart home system that best suits their individual needs and preferences without being tied to a specific, proprietary system.
• Comprehensive support for KNX and Homee: LUNOS offers comprehensive support for KNX, a widely used standard protocol in building automation. With special KNX controllers such as KNX-control4 and KNX-control4-REG, LUNOS devices can be integrated directly into KNX systems, enabling centralized control and automation.
• In addition, LUNOS supports integration into the Homee system, which is a modular and flexible smart home solution. By combining Brain Cube and EnOcean Cube, LUNOS devices can be controlled wirelessly and integrated into automation scenarios.
• Expandability and interoperability: The decision not to offer its own smart home solutions allows LUNOS to focus on developing and improving its ventilation technologies, while giving users the freedom to customize their smart home systems as they wish. This promotes interoperability with a wide range of devices and manufacturers, expanding the possibilities for automation and control.
• Customized solutions: LUNOS offers customization and consultations to ensure that integration with existing smart home systems runs smoothly. The company develops all interfaces itself, which means that tailor-made solutions can be realized for specific customer requirements.
• Future-proof: As LUNOS relies on open standards, users benefit from a future-proof solution. Open systems are less susceptible to technical obsolescence as they can be more easily updated and adapted to new technologies. This means that users can easily integrate their LUNOS devices into new smart home technologies in the future.

Air filters are a central element of our LUNOS systems, as they ensure that the incoming outdoor air is freed from pollutants, dust, pollen and other particles. Clean filtration reduces the risk of allergies and respiratory illnesses, as fewer pollutants enter the living space. At the same time, the filters also protect the technical components, such as the heat exchanger and ducts, from soiling, which extends their efficiency and service life. Regular maintenance and timely filter changes are therefore essential to ensure optimum air quality and operating efficiency in the long term. Overall, filtering the air makes a significant contribution to ensuring that you live in a healthy and pleasant indoor climate.

The filter change intervals in our LUNOS systems depend on the air quality in your environment and the frequency of use of the system. As a rule, we recommend changing or cleaning the filter every 3 to 6 months, although a shorter interval may be advisable in heavily polluted urban areas. Regular filter changes are crucial, as dirty filters can obstruct the air flow and increase energy consumption. Our systems are often equipped with an integrated filter change indicator that reminds you when the filter needs to be changed or cleaned. This regular maintenance ensures that the air quality remains consistently high and that your system is always energy efficient. In this way, we ensure that you benefit from an optimum indoor climate in the long term. Depending on the device and/or filter type, maintenance documents are available. Here you can read, for example, how often and under what conditions filters should be changed or cleaned. It also documents how individual appliances should also be checked and cleaned if necessary.

We use different filter classes in the LUNOS ventilation systems, which filter out different particle sizes as required. Typically, filters of class ISO Coarse >45% are used to capture coarse particles such as dust and pollen, while ePM10 filters or EPM2.5 filters retain even finer particles, which are particularly relevant for allergy sufferers. In addition, pre-filters are often used in our pollen filters to trap coarse impurities before the air reaches the main filter. These filter classes are specified in accordance with European standards so that a high level of purity of the supplied air is always guaranteed. By combining several filter stages, our systems offer the option of comprehensive air purification that meets the highest demands.

Yes, inadequate filter maintenance can lead to significant losses in air quality. If filters are not changed or cleaned for too long, they become clogged and increase air resistance, which hinders air exchange. As a result, less filtered fresh air enters the rooms and pollutants and allergens can accumulate. This can lead to health problems such as respiratory irritation and allergic reactions. In addition, energy consumption and noise increase as the fan has to work harder to maintain the desired air flow. It is therefore essential to maintain and change the filters regularly in order to guarantee both optimum operation and a healthy indoor climate.

The effectiveness of an air filter is measured by the percentage of particles it can remove from the air. This value is often specified as filter efficiency or particle retention rate and is based on standardized test procedures in which the retention of particles in defined size classes (e.g. 0.3 µm, 1.0 µm, 10 µm) is measured. A higher percentage means that the filter can remove more pollutants from the air, resulting in higher air purity. In addition, the pressure drop across the filter is measured, as too high a pressure drop can increase the energy consumption of the system. These parameters provide a quantitative basis for evaluating the performance of a filter and ensuring that the air supplied has the desired level of purity. In this way, our systems can be continuously optimized and adapted to the respective environmental conditions. All our filters have been tested by us and an independent institute and certified in accordance with European standards.

Activated carbon filters are not used in our ventilation systems. Although various filter options are available that can remove pollen, bacteria and viruses from the air, activated carbon filters are currently not practical for effectively filtering odors. The existing filters meet the EU requirements and the specifications of the DIBt general technical approval (abZ), but the effective removal of odors, even with activated carbon filters, is not possible. Third-party filters available on the market, which are advertised with high promises and are supposedly equipped with activated carbon, are in most cases completely useless and lose their odor-binding properties after just a few hours to a few days at most. Furthermore, we are not aware of any activated charcoal filters on the market that have been tested and certified in accordance with the European filter standard and can be used in domestic ventilation units of our size. High-quality activated charcoal filters or other types of filters, e.g. catalytic filters, are currently used almost exclusively in large systems such as ventilation systems for entire shopping centers or similar.

Our LUNOS systems are designed to make filter changes as simple and straightforward as possible for the end user. All our systems have removable filter modules or front covers that can be opened without special tools. This allows the filters to be replaced quickly and easily without the need for complex structural measures. You also receive detailed instructions and often video tutorials that explain the filter change step by step. An integrated filter change timer also reminds you in good time when the filter should be changed. In this way, we ensure that your system always works optimally and that the air quality remains high in the long term.

Yes, the condition and cleanliness of the filter have a direct influence on the power consumption of a ventilation system. A clean filter ensures low air resistance, which makes the fans work efficiently and consume less energy. However, if the filter becomes dirty or clogged, the pressure drop increases, forcing the fan to work harder to maintain the desired airflow. This leads to higher power consumption and reduced energy efficiency of the system. Regular maintenance and timely filter changes are therefore crucial to keep energy consumption low. Filter maintenance therefore plays a key role in the operating costs and environmental friendliness of your system. A small side note: If you use higher-quality filters, this is usually accompanied by a slight increase in power consumption and an increase in the ventilation unit's own noise. Higher-quality filters also need to be cleaned more often or replaced completely. Therefore, please always check whether higher-quality filters are necessary for your system. All our devices are designed to work optimally with the standard filters and to ensure the best possible air quality. A higher-quality filter is not always better for indoor air quality. Unfortunately, this is a widespread misconception.

At LUNOS, we attach great importance to making filter changes as user-friendly as possible for the end user. Many of our systems have easily accessible filter compartments that can be opened without the use of special tools. Thanks to detailed instructions and video tutorials, you can change the filter yourself and save on maintenance costs. However, it is important to adhere to the recommended replacement intervals to ensure the optimum function and efficiency of the system. If you have any uncertainties or specific technical questions, our customer service team will of course be happy to help. All in all, this simple handling enables uncomplicated and regular filter changes, which contribute significantly to the longevity of your system. If you do not want to or cannot carry out the filter change yourself, there are also specialized companies in your area that offer filter changes and device maintenance as a service.