Controlled living space ventilation as per DIN 1946-6 and DIN 18017-3

Support & Regulations

The construction of (residential) buildings has undergone major changes in recent years and has been supplemented by more and more energy-saving measures. In the meantime, the building envelope is so tight that hardly any heat can escape unused from the living space. At the same time, however, sufficient fresh air does not enter the building from the outside. As a result, moisture and the resulting mould endanger both the building fabric and the health of the occupants. For this reason, DIN 1946-6 has been regulating the new standards for compliance with air exchange since 2009..

What is DIN 1946-6?

The regulations of DIN 1946-6 require that the necessary degree of continuous ventilation be provided in new buildings or in energetically renovated buildings. This means that all mold infestation or pollutant load in the ambient air can be prevented. One requirement, for example, is user-independent ventilation, so that even in the absence of the residents there is sufficient air exchange. In addition, a detailed ventilation concept for the building must be drawn up. The DIN standard specifies four different ventilation levels: moisture protection, reduced ventilation, nominal ventilation and intensive ventilation. These range from permanent user-independent ventilation to prevent moisture damage (level 1) and hygiene contents (level 2), to ventilation for normal use of the room (level 3) and intensive use (level 4, for example when cooking).

When does the ventilation concept as per DIN 1946-6 apply?

The ventilation concept includes technical data of the building and clarifies questions about necessary measures through ventilation. In many cases, old buildings have a construction method that does not meet today's energy-saving requirements. Standards. Different for new buildings: The tight construction successfully prevents the escape of heating air, but also prevents a sufficiently high fresh air intake. New buildings must therefore meet the minimum requirements for (fan-assisted) air exchange. But even extensive renovations require compliance with DIN 1946-6 as soon as either more than 1/3 of all windows are replaced or at least 1/3 of the roof is insulated. After a complete subsequent insulation of the building envelope of an old building, the same requirements of the DIN standard apply as for a new building.

How is a ventilation concept according to DIN 1946-6 best implemented?

ZEWOTHERM is at your disposal for advice and day-to-day planning and installation of decentralised and central ventilation systems. Our ZEWO Air systems are designed to meet the requirements of the DIN standard. This includes, among other things, the fulfilment of fan-supported ventilation with supply and exhaust air systems as well as optimum energy efficiency, high sound insulation and the maintenance of hygienic requirements.

What is DIN 18017-3?

In addition to DIN 1946-6, there is the standard DIN 18017-3, which describes regulations for Lüftung´fensterloser Rooms in residential buildings. These include sanitary rooms such as bathrooms and WCs as well as storerooms and windowless kitchens. A fan in accordance with DIN 18017-3 must ensure, among other things, that no odours enter other rooms and that moisture is removed properly. In user-independent operation, the ventilation system requires a permanent air volume flow of 40 m³/h. The air volume flow rate must not exceed 40 m³/h. In demand-controlled systems, the volume flow during use is 60 m³/h, whereby it may also be reduced in times of low air demand.

What is the difference between DIN 1946-6 and DIN 18017-3?

Since windowless rooms are usually located on the inside, i.e. not on the outside wall of a building, fresh air often cannot be supplied directly from the outside. In contrast to DIN 1946-6, which is responsible for fans with direct external access, DIN 18017-3 therefore stipulates that the air supply is guaranteed via the adjacent living rooms (e.g. via the ZEWOTHERM ALD series). However, it does not contain the extensive regulations of DIN 1946-6, such as the four ventilation stages or requirements for room air quality.

How does ZEWOTHERM implement the ventilation concept according to DIN 18017-3?

ZEWOTHERM also offers the optimum solution for rooms that are particularly exposed to odours and moisture. Our SmartFan® XR is specially designed for indoor bathrooms and kitchens and meets the requirements of DIN 18017-3. We will be happy to answer any further questions you may have.