Free tool
Blower door test calculator
Enter your fan flow and volume to see whether the building passes.
Your test numbers
Have a result already? Drop it in.
ACH50 =
CFM50 × 60 ÷ VolumeRESULT
—
ACH50
0 (tight)6+ (leaky)
Enter your numbers to see the result.
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Schedule your blower door test
Serving PA, NJ, DE and MD. Multi-test discounts apply automatically.
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Enter your email to see live availability and book your test. You’ll select your services on the next step — please use this same email address there so we can show you your discounted total.
No signup required. Select your tests and time on the next step.
Rather talk it through? Call 888-213-3975 and we will sort it out in a minute.