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DIN 1946-6 - Ventilation of apartments according to the ventilation concept

With today’s energy-saving construction methods, building envelopes are so tight that sufficient air exchange cannot be guaranteed with just one window ventilation. This means that moisture damage, mold growth and the accumulation of pollutants in the room air can occur more easily than they did years ago. For this reason, various regulations (standards for ventilation systems) require not only a tight building envelope but also a minimum air exchange.

Provisions for the air exchange rate according to DIN 1946-6

The DIN standard 1946-6 shows possible solutions how a sufficient air exchange can be achieved in apartments and thus creates regulations for the ventilation of residential buildings in new construction or renovation. It “applies to the free and fan-assisted ventilation of apartments and similarly used room groups (usage units) [and] (…) specifies the requirements for planning, execution and commissioning, operation and maintenance of the necessary ventilation components (…) fixed “(Source: The DIN 1946-6 2009-05 standard). The ventilation must work independently of the user, i.e. even when the residents are absent. For the ventilation of windowless rooms, however, DIN 18017-3 applies.

Normen für Lüftungsanlagen: Lüftungskonzept nach DIN 1946-6

The planning and design criteria are intended to ensure that living spaces are supplied with a sufficiently large volume flow of outside air. If the occupancy is planned, this is necessary for the residents for reasons of hygiene and health. The requirements apply both to the entire usage unit and to each individual room.


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The ventilation concept according to DIN 1946-6


The requirement of a ventilation concept according to DIN 1946-6 is intended to clarify fundamental questions about the ventilation of a building or a usage unit. Changes to the building envelope result in changes to the ventilation of the rooms in this building, which is why a standardized ventilation concept must be drawn up for every new building as well as for extensive renovations of old buildings. In the case of old buildings, a ventilation concept is necessary if more than 1/3 of the existing windows in single and multi-family houses are replaced or more than 1/3 of the roof area in single-family houses is re-sealed. The planner or processor must determine how the necessary air exchange can take place from the point of view of hygiene and building protection. Please do not hesitate to contact us about the ventilation concept for a single-family home.

The ventilation levels according to DIN 1946-6 Symbol „Von der Community überprüft“


DIN 1946-6 requires proof of four ventilation levels for sufficient air exchange under different conditions of use. These were determined based on experience and studies on buildings. The four ventilation levels are based on characteristic user behaviors. According to the standard, four ventilation levels are initially distinguished in terms of their intensity. The different ventilation levels classify the performance of a ventilation system. If the air supply through building leaks is insufficient to ensure ventilation for moisture protection, the planner must provide ventilation measures. Find out more about the ventilation levels in our guide: “Why ventilate?”


4 ventilation levels: (DIN 1946-6)


Air exchange rate after …

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Based on the DIN 1946-6 standard and the requirements of EnEV and the funding programs, inVENTer offers a calculation tool for the professional design of the ventilation system and is happy to support you with the calculation by a competent service team. Contact us for free advice.

Conclusion on the subject of DIN 1946-6

With today’s energy-saving construction methods, building envelopes are so tight that sufficient air exchange cannot be guaranteed with normal ventilation behavior. DIN 1946-6 shows possible solutions for achieving a sufficient exchange of air in apartments. However, this standard contains open and partly contradicting passages. For this reason, the design should only be based on the 1946-6 standard. Too tight planning and interpretation of the standard can often lead to uneconomical solutions. InVENTer’s ventilation planning is carried out according to recognized regulations, namely according to EnEV, according to KfW funding conditions, both according to customer requirements and on the basis of DIN 1946-6 and DIN 4701-10.

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