Calculate the number of roof vents needed for proper attic ventilation. Balanced intake and exhaust vents ensure airflow and prevent moisture buildup.
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Total attic floor area.
Select the type of exhaust vent.
How this calculator works
Number of vents equals the attic floor area divided by the coverage per vent. Code typically requires 1 sq ft of net free area per 150 sq ft of attic space.
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