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Nesgroup address: alt.building.construction - Date & Time for the message: Sat, 21 May 2005 08:28:52 -0400 /

Author of the message: "BP"

Title of the message:
Re: Quick Attic Ventilation Question

Text of the message:
Complicated fluid dynamics.
At a layman's level, yes, they behave more like exhaust than intake in
greater than 50% of the cases. But, the way gable vents work is that air
blowing towards one vent creates positive air pressure and the air moving
away from the other vent creates negative pressure so one vent is intake and
the other is exhaust. Maybe on a perfectly calm day they would both exhaust.
Now a ridge vent work similarly. Air blowing over the top of the vent
creates a negative pressure area on one side of the vent that sucks the air
out of the attic. The replacement air is supposed to come from the soffit
vents, thus creating the cold air flow along the rafters that is the design
effect. But with the addition of gable vents this make up air will more
likely come from the gable vents as intake, not from the more distant soffit
vents. That is why it is recommended to do one or the other but not both
when it comes to attic venting.



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