Blower Door Test

Updated Mar 26, 2026

Diagnostic test measuring building air leakage rate. Depressurize building to 50 Pa, measure airflow (CFM50). Required by energy codes (IECC), LEED, Passive House. Results reported as ACH50 or CFM50/sf envelope. Identifies air barrier failures.

category

Testing — Air Tightness

passive house

0.6 ACH50

test pressure

50 Pascals

iecc requirement

5 ACH50 (CZ 1-2), 3 ACH50 (CZ 3-8)

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