Of vented area for every 300 sq.
Whirlybird attic fans.
How much air must be moved.
A largely arbitrary rule of thumb that s been adopted into most building codes calls for 1 sq.
An exclusive vari pitch base adjusts to a 12 12 roof pitch for use on many roof applications.
This device senses the attic s air temperature and.
Anytime the fan blade turns it draws air through the attic space.
Some electric fans run continuously but most are controlled with a thermostat.
All things being equal wind driven turbine vents also known as a whirlybird roof vent do move more air than flat vents but only when the wind blows.
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When installed with adequate intake ventilation the whirlybird turbine reduces energy bills and the likelihood of winter ice buildup.