Deduct the frame area from opening area for vent area by NFPA 68?
Deduct the frame area from opening area for vent area by NFPA 68?
(OP)
When calculating the actual vent area, should the frame area of vents be deducted from opening area? Thanks,





RE: Deduct the frame area from opening area for vent area by NFPA 68?
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.
RE: Deduct the frame area from opening area for vent area by NFPA 68?
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RE: Deduct the frame area from opening area for vent area by NFPA 68?