• Zinc-coated pressed steel enclosure; interior lined with sound-absorbent and fire-resistant material (DIN 13501) • Nominal diameter for duct connections: 125 mm. • EC brushless motors with shafts turning in ball bearings, coupled directly to centrifugal impellers; 3 speeds selectable at the moment of installation. • Air flow settable between 120 m3/h and 350 m3/h. • Ultra high efficiency cross-flow type heat recovery unit manufactured in plastic (polyethylene). • Automatically activated system designed to prevent icing of the heat exchanger. • 2 x ePM10 50% (M5) filters. ePM1 70% (F7) available as optional for supply. • Electronic control system. • Tie-bolts for suspended installation supplied as standard.