• Plastic (PPE) enclosure • Duct connection ports of nominal diameter 125 mm. • 2 EC (brushless) motors with shaft turning in ball bearings, each coupled to a backward curved centrifugal impeller; 3 speeds, selectable independently at the moment of installation. • Maximum air flow 220 m3/h. • Very high-efficiency counter-flow heat exchanger in PS resin. • Automatic, filtered 100% by-pass • Integrated frost protection. • 1 M5 filter on supply air, 1 G4 filter on extract air. • Electronic control with wired LCD display. • Brackets for wall-mounted installation.