Self-regulating ventilation for the window rebate
heroal window rebate ventilations for the window system heroal W 72 ensure a user-independent protection against moisture according to DIN 1946-6. This prevents the formation of mould inside the room and ensures the flow of fresh air, which might, for example, be needed for fans. A rebate ventilation is almost invisibly inserted into the internal seal of the window, and, with the window closed, can neither be seen from the inside nor outside. heroal window rebate ventilations do not require electricity. The air streams in automatically, because of the different pressure inside the building. In order to avoid unpleasant draught, the ventilation flap closes automatically in strong winds.