Installed in the gable end of the house, the Gable-Mount Power Vent uses a thermostat to help prevent heat buildup. It operates 30% more quietly than comparable units and with 35% greater efficiency. What''s 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.• WCGB• Premium gable-mount• Comes with automatic thermostat• Adjustable thermostat from 60 to 120 degrees• 1320 CFM for attics up to 1900 sq. ft.• 15" diameter housing• 14" diameter fan blade• 2.8 Amp motor• 6 blade• Needs 634 sqin of net free intake air• Patented rings instead of solid-steel housing, which pull more air• Operate 30% quieter and 35% more efficiently than comparable units.