• Fabricated structures with extruded aluminium sections enclosed by pressure diecast aluminium angle members • Sandwich infill panels: zinc-coated steel and expanded polyurethane. • Duct connection ports of 315 mm diameter, equipped with rubber seals. • 2 x single phase AC motor of external rotor type coupled directly to forward bladed and singly adjustable centrifugal impellers; 4 operating speeds. • Maximum air flow 1000 m3/h • Cross-flow type aluminium plate heat exchanger. • 2 x F5 filter (alternatively, option of F7 filters). • Option of electric preheat elements designed to prevent icing of the heat exchanger. • Option of electric or hydronic post-heating devices • Factory-prepared to accept pressure switches for monitoring the status of filters. • Condensate drain system with collection vessel.