Air Vent Power Roof Ventilator 14" Fan 25" Dia. 1500 Sq Ft Max. 1170 Cfm 1/10 Hp Rv26wwmt weatherwood roof mounted power attic ventilator. 25 in. Diameter metal dome. 1170 cfm&#44; ventilates up to 1650 sq. Ft. With adjustable thermostat from 60 to 120 degrees. 2.8 amp motor&#44; 6 bladed fan blade.