A turbine vents spins with the slightest breeze.
Turbine vents on roof.
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The popular ridge and soffit ventilation systems and the traditional metal pot vents are also passive ventilation systems.
How doers get more done.
Since turbines are attached directly to attic spaces they can siphon away that moist air effectively.
As soon as it starts to spin it vacuums air out of your attic.
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A single 14 inch diameter turbine vent that is subjected to 15 mph winds can expel up to 1 342 cfm of air.
A small 12 inch diameter turbine vent with a constant wind speed of 5 miles per hour mph can remove 347 cubic feet of air per minute cfm from the attic space.