designsimple
Structural
When calculating the actual vent area, should the frame area of vents be deducted from opening area? Thanks,
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Deduct the frame area from opening area for vent area by NFPA 68?
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Yes. The manufacturer will quote the actual vent size. The actual vent size is not something that you calculate.
The actual vent size will be about 7-10% smaller than the vent frame opening size. The frame opening size is also smaller than the vent frame outside dimensions.
The actual vent size will be about 7-10% smaller than the vent frame opening size. The frame opening size is also smaller than the vent frame outside dimensions.
Forgot the link to the suppliers:
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