Of vented area for every 300 sq.
Whirlybird attic fans.
The whirlybird s large flashing makes installation easy.
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.
Air movement in the attic helps prevent moisture buildup on rafters and on the bottom of roofing materials.
In summer air movement helps rid the attic space of.
An exclusive vari pitch base adjusts to a 12 12 roof pitch for use on many roof applications.
How much air must be moved.
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A largely arbitrary rule of thumb that s been adopted into most building codes calls for 1 sq.