GABLE MOUNT INSTALLATION: Requires permanent electrical wiring and grounding, do not use with an electrical extension cord; intended for gable installation only VENTILATE AN ATTIC OR GARAGE: Prevent heat and moisture build-up for a cooler, drier attic, which lowers your air conditioning expense. Fight heat, humidity buildup and unwanted smells inside the garage. Effectively ventilate a one, two or three car garage, either attached or detached from the home HIGH QUALITY, EFFICIENT OPERATION: Operates on 760 CFM; precision-balanced 14" metal blade allows maximum airflow: galvanized steel housing for added strength FEATURES: Unit operates automatically with an adjustable, built-in thermostat for your convenience DIMENSIONS: Housing measures 15" diameter x 8" D with a 14" diameter steel blade that is specially designed for maximum airflow