Upblast Ventilator Drive Type - Roof Ventilators Direct Drive Drive Package With Motor Included Yes Base Size - Roof Ventilators 22 in x 22 in Duty Rating - Roof Ventilators Standard Voltage - Roof Ventilators 115V AC/230V AC Motor HP - Roof Ventilators 1/2 hp Mounting Location - Roof Ventilators Roof Number of Speeds 1 Wheel Dia 12 1/2 in CFM @ 0.000-In. SP 2037 Sones @ 0.125-In. SP @ 5 ft 16.1 Assembled 1 Phase Base Height 1 3/4 in