The popular ridge and soffit ventilation systems and the traditional metal pot vents are also passive ventilation systems.
Attic wind turbine vents.
A ridge vent runs across the top of the roof s peak.
A turbine vents spins with the slightest breeze.
A turbine is installed directly on the top of a roof and uses wind power to suck hot and humid air out of the attic.
Turbine fans have angled slits cut into a capped cylinder which create a continuous fan blade.
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This pulls hot humid air from the attic.
Wind driven turbine vent wind driven roof vents will pull more air from the attic but only when the wind is blowing.
A turbine has a series of vanes that spin as wind passes through them.
As soon as it starts to spin it vacuums air out of your attic.
Airhawk wind turbines 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.
A turbine vent is a passive ventilation device.
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They do it with a series of specially shaped vanes that catch the wind and provide rotary motion.
Unlike turbines this venting style does not have any moving parts.
How much air must be moved.