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This Airmaster 42711 belt drive exhaust fan has a 36" blade diameter, a venturi housing, and is suitable for ventilating a building to the outside. It has a 1-speed, 230/460V, three phase, 1 hp, permanently lubricated, totally enclosed ball bearing motor. The blade assembly (consisting of a pulley, steel hub, and spider) holds the fan head's four aluminum paddles, and a belt between the motor and fan pulley drives the fan. The epoxy-coated steel venturi housing allows the fan to be installed without external framing, and self-closing shutters (not included) can protect the fan from rain and snow when not in operation. The motor of the belt drive exhaust fan is out of the air flow path, making it suitable for use in the presence of dust or other airborne debris. This belt drive exhaust fan is Underwriters Laboratories (UL) Listed for quality assurance and is suitable for use in building ventilation, such as for a warehouse.SpecificationsMotor1-speed, 230/460V, three phase, 1 hp, permanently lubricated, totally enclosed ball bearing motorMountEpoxy-coated steel venturiSwitch typeNo switchCordNo cord, junction box provided for wiringBladesAluminum (4), belt-driven pulleyBlade guardsNo guardCubic feet per minute (CFM)12,475Weight148 Lbs.Specifications metUL ListedDimensions*42 x 42 x 19-1/8 inches (H x W x D)*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.Industrial fans are used in w