"This Canarm Wall Exhaust Fan is efficient, easy-to-install and low maintenance. HP 1/3, Dimensions L x W x H in. 23 1/4 x 21 x 23 1/4, Speed RPM 1,700, Dimensions L x H in. 23 1/4 x 23 1/4, Air Delivery CFM 3,150, Volts 115/230, Depth in. 21, Fan Diameter in. 18, Needs to be Hardwired Yes, Speeds qty. Variable, Amps 3.8/1.9. Totally enclosed and thermally protected motor Blades are galvanized and well-balanced for durability and efficiency Heavy wire chrome-plated OSHA guards Rugged steel welded box housing with durable powder-coat finish Aluminum louver shutters with long life nylon bushing Requires hard-wired connection"