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Old 08-15-2009, 07:13 PM   #1
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Is this proper ventilation?


I have gable roof with a 90’ foot ridge. I plan on using a Ridge vent (Cobra Snow Country) to help ventilate my attic. According to 1/300 rule (2700 sq. ft. of attic), I calculated that I need 648 Sq. inches of NFVA exhaust ventilation and 648 sq. inches of NFVA intake. The ridge vent I plan on using has specs of 16 sq. inches per lineal foot NFVA that comes out to (16x90ft) 1440 sq. inches of NFVA. Is this too much or can I balance this out with more under eave vents? I have the feeling that my 1960’s home doesn’t have the proper amount ventilation passing through the eaves. What should I do? Does anybody have a better recommendation for ridge vent other than Cobra? Are my NFVA calculations correct?

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Old 08-15-2009, 08:54 PM   #2
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Is this proper ventilation?


Shingle Vent II from www.AirVent.com has 18 square inches per foot.

But, you really need to address the amount of Intake Ventilation to make any type of Exhaust Venting work properly.

Ed

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