• Zinc-coated pressed steel enclosure; interior lined with sound-absorbent and fire-resistant material (DIN 13501) • Duct connection ports of nominal diameter 150 mm. • 2 x EC brushless motor with shaft turning in ball bearings, each coupled to a backward curved centrifugal impeller; 3 speeds, selectable independently at the moment of installation. • Air flow settable between 115 m3/h and 350 m3/h. • Ultra high-efficiency counter-flow type heat exchanger fashioned from moulded plastic (PS). • Automatically activated system designed to prevent icing of the heat exchanger. • 2 x F5 filter (alternatively, option of F7 filter on outlet duct) • Blocked filter status monitoring system • Brackets for wall-mounted installation