Air Vent 53319 Gable Mount Power Attic Ventilator, WCGB, 1320 CFMInstalled 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