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What is net free area (NFA)?

April 26, 2017area Free NET nfa

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What is net free area (NFA)?

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Net free area is the standard of measurement used by our industry. It is the unobstructed area of a ventilator through which air may flow. For an example, a C816 cornice vent is a 16×8 vent. The hole cut for this vent would be approximately 15 inches long by 7 inches wide. The area of the opening would be 105 (7×15) square inches but the net free area of a Lomanco C816 is 65 square inches. The louvered section and screening hinder the air flow and their net free area is lessened by their measurements.