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For use in general clean air environments, this exhaust ventilator is designed for continuous operation. It is typically used for short and/or average resistance duct work. The housing is constructed of heavy-gauge aluminum with a rigid internal support structure, a curb cap, a birdscreen, and a steel drive frame.<br /><br /> Item: Downblast Ventilator<br /> Drive Type - Roof Ventilators: Direct Drive<br /> Duty Rating - Roof Ventilators: Standard<br /> Drive Package With Motor Included: Yes<br /> Voltage - Roof Ventilators: 115<br /> Motor HP - Roof Ventilators: 1/15<br /> Base Square Size - Roof Ventilators: 19" x 19"<br /> Number of Speeds: 3<br /> Mounting Location - Roof Ventilators: Roof<br /> Wheel Dia.: 8-1/4"<br /> Item - Roof Ventilators: Downblast Ventilator<br /> CFM @ 0.000-In. SP: 520/644/768<br /> CFM @ 0.125-In. SP: 420/565/701<br /> CFM @ 0.250-In. SP: 293/478/633<br /> CFM @ 0.375-In. SP: -/373/557<br /> CFM @ 0.500-In. SP: -/-/473<br /> CFM @ 0.625-In. SP: -/-/338<br /> CFM @ 0.750-In. SP: -/-/-<br /> Sones @ 0.125-In. SP @ 5 Ft.: 3.9/5.4/7.5<br /> Sones @ 0.250-In. SP @ 5 Ft.: 4.2/5.5/7.4<br /> Phase: 1<br /> Hz: 60<br /> Max. Operating Amps: 1.48/1.82/2.44<br /> Max. BHP: 0.02/0.05/0.08<br /> RPM: 1050/1300/1550<br /> Base Height: 1-3/4"<br /> Overall Dia.: 21-3/4"<br /> Overall Height: 14-5/8"<br /> Shaft Dia. Wheel End: 1/2"<br /> Max. Inlet Temp.: 130 Degrees<br /> Housing Material: Spun Aluminum<br /> Wheel Material: Aluminum<br /> Wheel Type: Backward Inclined Centrifugal<br /> Speed Control: 48C172<br /> Speed Controllable: Yes<br /> Adj. 12 3/8"H Roof Curb Stock No.: 4C670<br /> Adj. 6 3/8"H Roof Curb Stock No.: 4C453<br /> Assembled/Unassembled: Assembled<br /> Recommended 12 In. Fixed Curb Item No.: 2RB75<br /> Recommended 8 In. Fixed Curb Item No.: 4HX38<br /> Agency Compliance: AMCA Sound & Air, UL/cUL 705, CSA Certified Motor<br /> Dimension A: 19"<br /> Dimension B: 21-3/4"<br /> Dimension C: 14-5/8"<br /> Dimension D: 4"<br />