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Old 12-31-2008, 12:42 PM   #1
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More ridge vent than soffit: Good/Bad?


I am venting dormers with ridge vent and Smart vent.

I can get 72 to 90 sq in intake, and up to 126 sq in exhaust.

This total greatly exceeds 1/150 requirements(4x9 area), so ok there.

My question is, should I reduce the exhaust to equal the intake,

or is it better to maximize the exhaust even though it exceeds intake as

mentioned above?

Thanks in advance, and have a safe day.

Alan

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Old 12-31-2008, 01:38 PM   #2
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More ridge vent than soffit: Good/Bad?


i was told you should have more intake then exaust i think it 2/3 intake 1/3 exaust im assuming it has to do with air pressure and proper air flow

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Old 12-31-2008, 01:43 PM   #3
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More ridge vent than soffit: Good/Bad?


Funny. I thought exhaust area should be larger than intake on non fan assisted ventilation. Must check buildingscience.com on this.
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Old 12-31-2008, 02:55 PM   #4
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More ridge vent than soffit: Good/Bad?


Joe Lstirubek himself claims that he would prefer all soffit ventilation instead of all exhaust ventilation, given that as the only option.

A 60% Intake to 40% Exhaust is the most desirable.

With such a small area, it shouldn't present a problem for the OP's case though.

Ed
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Old 01-01-2009, 01:01 PM   #5
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More ridge vent than soffit: Good/Bad?


most mfgr`s quote "balanced ventilation",which would infer they be the same--little extra exhaust won`t hurt though,just don`t run other vents that would effect the cross ventilation(bottom to top) function
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