• Cabinet: zinc-coated pressed steel (10/10) insulated with polyethylene sound absorbent padding (10 mm) Class I, surface finish self-adhesive metal foil. • Inlet and outlet ports of rectangular section. • 3 speeds single phase AC motor, coupled to a forward-bladed double inlet centrifugal impeller. • Rain canopy and/or anti-bird and anti-intrusion cowl (optional). • Electric cable gland on front panel. • Interchangeable inspection panel with handle and triangular key. • Vortice speed controller