Fan pwr gabl w/thermstat | installed in the gable end of the house, the gable-mount power vent uses a thermostat to help prevent heat buildup and a humidistat to fight moisture buildup inside the attic. It operates 30% more quietly than comparable units and with 35% greater efficiency. Whats more, since many homes already feature a gable or gable vent, it may not be necessary to cut a hole to install the gable-mount ventilator.apghpremium plus gable-mountcomes with automatic thermostat and humidistatadjustable thermostat from 60 to 120 degrees & adjustable humidistat from 20% to 90%1620 cfm for attics up to 2300 sq. Ft.15 diameter housing14 diameter fan blade3.7 amp motor4 bladeneeds 778 sqin of net free intake airpatented rings instead of solid-steel housing, which pull more airoperate 30% quieter and 35% more efficiently than comparable units.