The ventilation opening integrated into the side of the window frame ensures discreet but effective ventilation - invisible from the outside

Stainless steel self-acting closing flap

Touchpad operation

This negative pressure causes the sealing water in the siphon to be sucked out

With the external corner

Marley Air 4.0 Frischluft-wärmetauscher The ventilation opening integrated intoThe Marley Air 4. 0 a decentralized ventilation unit made in Germany with heat recovery of up to 80%. It impresses with particularly low operating noise and high performance with low consumption (energy efficiency class A). Tool free maintenance makes the Air 4. 0 the perfect solution for do it yourself installation. Fresh and healthy indoor air at all times and protection against mold growth: Decentralized systems for controlled domestic ventilation