Calculating NFA - BPA.gov - Bonneville Power Administration

Net Free Area (NFA) - Net venting area Screen Factor (SF). adjusting for insect screen, louvers, and weather coverings. The net free area is Mesh SF w/o Louvers SF w/Louvers Eave Vent always less than the actual area. 1/4 or 1/2 Screen Factor (SF) - Adjusts for airflow 1/8 obstructed by screens and louvers. 1/16 Calculating NFA. If vents are high and low, divide by 300. / OR. =. Gable Vent Attic Area If vents are all on the same level, divide by 150 Net Free Area (sq. ft.) (NFA) Required NFA for Common Attic Vents Attic vents NFA Eave vents (Bird NFA Soffit vents NFA. Blocks). Roof Jack 7 Roof Jack 1 Hole 4 x 16 8 Roof Jack 2 Holes 6 x 16 9 Roof Jack 4 Holes 8 x 16 10 Roof Jack Small Rectangle 12 Roof Jack Large Rectangle 12 x 12 Gable Vent 3 x 15 Eave Screen 12 x 18 Gable Vent 3 x 23 Eave Screen 12 x 24 Gable Vent 5 x 15 Eave Screen Soffit Vent 5 x 23 Eave Screen NFA for roof ridge vent systems varies.

Calculating NFA Attic Area (sq. ft.) / If vents are high and low, divide by 300 OR If vents are all on the same level, divide by 150 Net Free Area (NFA) Required = Created Date:

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