Air Vent 17.8 in. H X 20 in. W X 20 in. L X 12 in. D Mill Aluminum Brace TurbineA 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. UPC: 046462203504 Manufacturer Part No: TIBS0000 Brand Name: