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| Net Free Area of Ventilation Per Linear Foot |
| AIR SPACE DIMENSION |
NFA/LF |
| 1" Air Space |
8.75 sq. inch |
| 1.5" Air Space |
13.13 sq. inch |
| 2.0" Air Space |
17.50 sq. inch |
| The NFA is derived by multiplying the air space dimension in inches by the length in inches of the CrossVent board (less the spacing strips) and then dividing by eight, the length in feet of each panel.The ventilating capabilities of the soffit and ridge vents should be matched to the Net Free Area of ventilation (NFA) of the CrossVent. | |
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