Share 'Ridge Vent NFA'
I'm confused. If a ridge vent is advertising 18 in² of Net Free Vent Area (NFA) per linear foot, yet is only 3/4" thick, what is the real NFA. 18 in² would be the exposed edge of the vent (9 in² each side) and doesn't seem to be accounting for the internal construction of the vent, which varies, which prevents snow and rain from blowing in. If we are to calculate high and low vent areas, I have…
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