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Back to Knowledge Hub04.04.2025
Exhaust air system – a term that is becoming increasingly important in relation to the ventilation of houses and apartments. But what exactly is behind this technical system? An exhaust air system plays a crucial role in ensuring a healthy indoor climate by removing stale air and simultaneously supplying fresh air to the building. In this article, we will take a detailed look at exhaust air systems and their various designs: from the basic technical aspects and advantages to installation and efficient use in everyday life. Learn how an exhaust air system works, which standards and requirements must be observed, and what the differences are between central and decentralized systems.
An exhaust air system is an important component of a ventilation system in a building, whether in a house or an apartment. This system serves to remove stale or polluted air from rooms and replace it with fresh air from outside. Exhaust air fans are used to extract humid or polluted air from kitchens, bathrooms, or basements to the outside. To ensure even air circulation, appropriate supply air openings must be planned to allow fresh outside air to flow in. This is done either via window rebate ventilators or special outside air inlets in the facade.
While central ventilation systems are mostly used in new buildings due to the considerable installation effort involved, decentralized ventilation units offer a flexible and energy-efficient alternative for different configurations and are also suitable for renovations and existing buildings due to their significantly simpler installation options, which do not require special ventilation ducts.
There are various types of mechanical ventilation, including exhaust fans that direct stale air directly to the outside and supply air systems that bring fresh air from outside into the room. These systems can be manually controlled or automated to ensure that air quality remains optimal.
The most effective way to use mechanical ventilation as a mold control measure is to install ventilation systems with heat recovery. These systems not only supply fresh air, but also use the heat from the exhaust air to preheat the incoming air. This saves energy and creates a comfortable indoor climate that counteracts mold growth.
It is important to note that regular maintenance of mechanical ventilation systems is essential to ensure their effectiveness. Filters should be cleaned or replaced regularly to ensure optimal air circulation and prevent mold growth.
Decentralized ventilation units from Ventomaxx without heat recovery are available in the SILENT COMFORT and ECO COMFORT series.
The SILENT COMFORT PLUS series ensures emission-free fresh air supply and is one of the most powerful, fan-assisted soundproof ventilation series on the market (with sound insulation up to 66 dB, Dn,e,w). The series offers you the solution for highly user-oriented and, above all, demand-oriented ventilation of individual rooms (bedrooms, living rooms, offices, etc.).
The ECO COMFORT series, available with either PLUS DESIGN or IQ DESIGN panels, are the exhaust air solutions for all rooms with high odor and humidity levels that require maximum comfort (rest rooms, kitchens, bathrooms, toilets, etc.). Fully integrated into the exterior wall, the exhaust air units have very high passive sound insulation of up to 55 dB, Dn,e,w.
An important aspect when planning an exhaust air system for apartments or houses is determining the required air exchange rate. This indicates how often the entire room air is renewed per hour. According to DIN 1946-6, an air exchange rate of at least 0.5 to 1.5 is recommended for damp rooms, depending on the use and size of the room. Installation requires careful planning and should ideally be carried out by specialists to ensure efficient and trouble-free operation. Regular maintenance and cleaning of the system is also essential to maintain proper functionality over the years.
Thanks to the continuous removal of stale air and moisture, an exhaust air system ensures that the air quality in your home remains fresh and pleasant at all times. The efficient operation of the exhaust air system also quickly and effectively removes moisture generated by cooking, showering, or other everyday activities. This helps to prevent the formation of mold and moisture damage in living spaces, which in turn protects the structure of your home and promotes the health of its occupants.
Another important advantage is the reduction of unpleasant odors and cooking fumes. The exhaust air system extracts these directly and transports them outside, resulting in a more pleasant indoor climate and improved quality of living.
Furthermore, exhaust air systems help to save energy and reduce heating costs. Since warm indoor air is not lost unnecessarily through ventilation with open windows, the room temperature remains constant, which reduces overall energy consumption.
In addition, modern solutions offer the option of heat recovery, which preheats the fresh supply air and thus also contributes to energy savings.
All in all, an exhaust air system in the house creates a healthy and comfortable living environment, protects against moisture damage, reduces odors and cooking fumes, saves energy, and thus increases both the comfort of your home and the value of your property.
When installing exhaust air systems in houses and apartments, certain requirements and standards must be observed to ensure safe and efficient operation:
Furthermore, exhaust air systems must be designed to ensure sufficient air exchange without consuming too much energy. This not only serves the comfort of the residents, but also prevents moisture problems and mold growth.
Another important aspect in the planning of exhaust air systems is sound insulation and soundproofing. Exhaust air systems must not be too loud so as not to disturb the occupants. There are specific standards that regulate the maximum sound pressure levels of ventilation systems in residential buildings.
In addition to the technical requirements, legal regulations also play a role. Depending on the country and region, different building regulations and energy standards may apply, which must be taken into account when planning and installing exhaust air systems.
It is therefore advisable to find out about the applicable standards and requirements before installing an exhaust air system to ensure that the system meets the necessary standards and functions smoothly.
The planning and installation of an exhaust air system in a house requires careful consideration and expertise. First, a needs analysis should be carried out to determine the exact air exchange requirements of the room in question. Factors such as room size, intended use, and number of people play a decisive role here. It is important to dimension the exhaust air system so that it operates efficiently and energy-savingly. The structural conditions must of course also be taken into account. A decision must be made as to whether a central or decentralized exhaust air system should be installed.
The installation of an exhaust air system requires precise craftsmanship. The correct placement of the exhaust air units, the possible laying of air ducts, and the installation of the ventilation units must be carried out carefully to ensure optimal functionality. It is important to install all components in accordance with applicable standards and guidelines to ensure safe and efficient air flow.
The exhaust air system should be commissioned and adjusted by a specialist to ensure that it functions optimally. Regular maintenance and cleaning are also essential to maintain the performance of the exhaust air system and ensure air quality in the home.
Structural requirements & planning steps
Avoiding typical mistakes
Seek advice from experts to ensure that the system meets your individual requirements and is installed professionally.
Maximum sound insulation with Ventomaxx: Three types of sound insulation elements
When it comes to sound insulation in ventilation systems, choosing the right fans plays a crucial role. Ventomaxx offers innovative soundproof fans that provide effective sound insulation in living spaces. Ventomaxx fans are characterized by their high quality, durability, and efficient sound insulation.
At Ventomaxx, we offer three different types of sound insulation elements to ensure optimal soundproof ventilation. Our solutions achieve impressive sound insulation values against external noise in the range of 41 to 75 dB Dn,e,w. Here are the details of our elements:
SR ELEMENT
Our SR element is ideal for applications that require high air flow. It is suitable for wall thicknesses from 280 mm and offers outstanding sound insulation from 45 to 75 dB Dn,e,w. These properties make it a first-class choice for demanding projects where both air circulation and noise protection are crucial.
SD ELEMENT
The SD element impresses with its high flexibility and adaptability. The sound insulation can be adjusted to specific requirements after installation, with values of up to 65 dB Dn,e,w. It is suitable for wall thicknesses of 180 mm and above and has proven itself on the market for over 20 years. This versatility makes the SD element a preferred solution for a wide range of construction projects.
SBV ELEMENT
Our SBV element is the perfect choice for particularly low-draught air outlets on the room side and increased wind loads. It offers sound insulation of up to 65 dB Dn,e,w and is designed for wall thicknesses of 280 mm and above. The special properties of the SBV element make it ideal for demanding environments where wind loads and draughts must be minimized.
Independent test reports from ift Rosenheim confirm that our soundproof ventilation systems have the highest sound insulation values (between 41 and 74 dB, Dn,e,w) when open. ift Rosenheim is a renowned institution that conducts independent testing and certification in the field of building products.
Ventomaxx soundproof ventilators certified by ift Rosenheim offer you safety and certainty in terms of excellent sound insulation. The outstanding sound insulation values (Dn,e,w) demonstrate the effectiveness of our ventilation systems in reducing external noise, thus contributing to quiet and pleasant room acoustics.
With our SR, SD, and SBV elements, Ventomaxx ensures that you will always find the right solution for your requirements. Whether you need maximum air flow, maximum flexibility, or special suitability for increased wind loads, our sound insulation elements always offer you optimum protection against outside noise while providing excellent ventilation. Rely on Ventomaxx for first-class soundproof ventilation solutions.
Some key advantages:
Mold prevention through controlled living space ventilation – especially in apartments, basements, and bathrooms.
Improvement of air quality through the removal of pollutants.
Reduction of CO₂ levels in enclosed spaces.
Subsidies are available from KfW, BAFA, and regional programs.
Potential disadvantages:
Heat loss without heat recovery: not all decentralized ventilation systems are equipped with heat recovery. Ventilation systems without heat recovery are cheaper to purchase and easier to maintain. They are particularly suitable for rooms where continuous ventilation is important but heat loss is not a major factor – for example, in less frequently used rooms such as basements, storage rooms, or garages. At the same time, these systems ensure the officially required air exchange rates.
Higher operating costs for inefficient models: Our energy-efficient ventilation systems, on the other hand, guarantee optimal air circulation—even in rooms with odors and humidity—and offer outstanding sound insulation of up to 65 dB Dn,e,w.
The advantages mentioned above provide good arguments for purchasing exhaust air systems, while the possible disadvantages can be avoided by choosing suitable solutions. Please feel free to contact us if we can assist you in selecting a suitable solution. Send us an email at info@ventomaxx.de or call us at +49 (0) 871 – 95 34 06 – 0. Our team is here for you and will support you every step of the way.
When planning and installing an exhaust air system in your home, it is important to be fully informed about how it works and its advantages. An exhaust air system ensures efficient air circulation and thus contributes to improving indoor air quality.
Targeted ventilation is very important for problems such as condensation on windows. Information on prevention and solutions can be found on the Ventomaxx website on the topic of condensation on windows.
Explore the world of exhaust air systems in houses and apartments
With an efficient exhaust air system, you can supply your home with fresh air and at the same time ensure a pleasant indoor climate. These systems work by continuously removing stale air and replacing it with fresh air from outside, which contributes to a healthy living environment. The advantages of a well-planned and professionally installed exhaust air system in your home are manifold. Not only can they help reduce humidity and pollutants, they can also save energy costs and increase living comfort.
Choosing the right exhaust air system depends heavily on the type of building, the structural conditions, and the energy efficiency goals. While central exhaust air systems are a suitable option, especially for new buildings, decentralized ventilation units are also very well suited for apartments, existing buildings, and renovations.
In any case, early planning is crucial for implementing an efficient ventilation concept. Tradespeople benefit from the simple installation of decentralized systems, which can be flexibly integrated into any construction project. It is crucial to observe the requirements and applicable standards when planning and installing an exhaust air system in order to ensure optimal functionality. Both central and decentralized exhaust air systems offer individual advantages and can be adapted to the needs of your home. Overall, integrating an exhaust air system into your home offers numerous advantages and contributes to improving your quality of life.
Contact
We provide architects and technical planners tailored solutions to address every ventilation challenge with precision. Whether it is sound insulation, energy efficiency, or optimising facade aesthetics, our expert technical teams are equipped to provide you with the ideal solutions.
With Ventomaxx, you gain access to comprehensive hybrid ventilation concepts that seamlessly combine passive and active systems from a single, trusted source. Our mission is to improve indoor air quality in the most efficient way.
We provide architects and technical planners tailored solutions to address every ventilation challenge with precision. Whether it is sound insulation,
energy efficiency, or optimising facade aesthetics, our expert technical teams are equipped to provide you with the ideal solutions.
With Ventomaxx, you gain access to comprehensive hybrid ventilation concepts that seamlessly combine passive and active systems from a single, trusted source. Our mission is to improve indoor air quality in the most efficient way.
