Blower door quick calculator
Infiltrometer quick calculator: turn a blower door reading into ACH50, leakage area and estimated natural air change. Nothing is saved. Sign in for client records, duct tests and reports.
Results
ACH50
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CFM50
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Leakage area (25 Pa)
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Natural ACH (N-factor)
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Air changes / day
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CFM50 per sq ft
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Energy code check
Enter a state to compare with its ACH50 limit.
Nearest design station: use "Zone from my location"