Air Vent 17.8 in. H X 20 in. W X 20 in. L X 12 in. D Mill Aluminum Brace Turbine

A non-electric alternative to ventilation, these vents use the natural force of wind and air pressure to spin and vent out stale attic air. They do it with a series of specially shaped vanes that catch the wind and provide rotary motion. This pulls hot, humid air from the attic. Turbine vents provide a low-cost ventilation alternative in areas where wind speeds of at least 5 mph are typical. SPECIFICATIONS Maintenance-free dual bearing system Adjustable base Polypropylene bracing system Product Type: Brace Turbine Local SKU Available Stores: ALL Brand Name: air-vent Color: mill Diameter: 12-inch Height: 17.8-inch Interior Louver: yes Length: 20-inch Material: aluminum Net Free Area: 95-square-inch Pitch: 3/12---12/12 Shape: circle Vent Type: wind-turbines Width: 20-inch