Pressurization Leakage Area Calculator

Calculate equivalent leakage area for pressurized spaces including doors, walls, and penetrations

Input Parameters

Results

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Total Door Leakage Area
ft2
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Equivalent Wall Leak Area
ft2
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Total Equivalent Leak Area
ft2
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Leakage at 0.05 in.wg
CFM
Note: Leakage area data per ASHRAE Handbook and NFPA 92. Typical door gap: 1/8 to 3/16 inch. Tighter construction reduces pressurization air requirements. Conduct door fan tests for accurate leakage data on existing buildings.

Reference

Leakage Area Calculation: Door Leak Area = N_doors x Perimeter x Gap Width Wall Eq. Area = (Wall Leak Rate x Wall Area) / (2610 x sqrt(dP_test)) Total Leak Area = Door + Wall + Penetrations Leakage CFM = 2610 x A_total x sqrt(dP_design) (Orifice equation: Q = 2610 * A * sqrt(dP))