Air Vent TOBS0000 Brace Turbine, AluminumThese 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. Highlights: Color: Mill Material: Aluminum Height: 20. 2 inch Length: 12 inch Diameter: 12 inch Pitch: 3 12 12 12 Vent Type: Wind Turbines CFM: 345 CFM Shape: Circle Airflow: 110 CFM Air Vent's wind turbines are
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