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. This pulls hot humid air from the attic.They do it with a series of specially shaped vanes that catch the wind and provide rotary motion..
Turbine vents provide a low-cost ventilation alternative in areas where wind speeds of at least 5 mph are typical.. This pulls hot humid air from the attic.