The Canarm 300 Series Forward Curved Roof Exhauster is designed for economical use in schools, hospitals, high-rise apartments and commercial and industrial buildings where quiet operation is essential. Features a square base that allows discharge to be oriented in any of 4 directions, backdraft damper and bird screen included, cabinet insulated with 1/2" fiberglass insulation, heavy duty ball bearings rated for -65°F to +250°F, low operating RPM for minimal noise, blower mounted on heavy steel angle with rubber isolators, and grey baked powder coat finish. Recessed base ensures weatherproof mounting to curb.