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Roof Vent Calculator

The Tool Below Will Help You Determine HUD Minimum Ventilation Requirements.

Calculate Minimum Net Free Area

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Square Inches
Ridge Vent

180 sq inches per piece (10 LF)

Off-Ridge Vent

2′ Vent = 66 sq inches
4′ Vent = 138 sq inches
6′ Vent = 210 sq inches
8′ Vent = 282 sq inches

Hurricane Country Shingle Over Vent

4′ Vent = 72 sq inches

Hurricane Country II Shingle Over Vent

4′ Vent = 72 sq inches

Under Eave Vent

16″ x 4″ = 22 sq inches
16″ x 8″ = 58 sq inches
8′ Continuous = 61 sq inches

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