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.
Turbine vents on roof.
A turbine vents spins with the slightest breeze.
As soon as it starts to spin it vacuums air out of your attic.
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How doers get more done.
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The popular ridge and soffit ventilation systems and the traditional metal pot vents are also passive ventilation systems.
Since turbines are attached directly to attic spaces they can siphon away that moist air effectively.