With this particularly efficient system, all rooms in the residential unit are equipped with heat recovery units - exactly where they are needed. If you are interested in this type of ventilation, we recommend our proven e² series fans.
In combined systems, at least two different types of ventilation are used together. Combinations of extract air units and fans with heat recovery are particularly effective: while living spaces have constant fresh air without heat loss thanks to heat recovery units, classic extract air rooms such as bathrooms, toilets, kitchens or hot water boilers can be ventilated cost-efficiently as required. For windowless bathrooms and WCs, such an exhaust air unit is even mandatory.