Avent P190 fresh air unit with heat recovery cross-counter-current heat exchanger made of aluminium. 4 connectors (FOL / AUL / ZUL / ABL) at the top side of the unit NW125, additional connector (ZUL) at the bottom side of unit. Right / left version by switching at the unit. Front control panel incl. alarm function and 4 ventilation levels according to DIN 1946-6 Capacity level 3: 140 m3/h