Is it possible to ventilate apartment buildings with heat recovery systems?
airflow, which conducts from outside

Yes, for example, using the compact and space-saving ventilation systems of the Avent P series which can be placed in a storage room.
This allows for heat recovery and billing of the power costs per apartment. When installing central air lines (outgoing air and outside air) in apartment buildings, the local fire protection requirements must be discussed with the responsible expert in time.

