Blower door test results form 2026

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  1. Click ‘Get Form’ to open the blower door test results form in the editor.
  2. Begin by entering the site address at the top of the form. This is crucial for identifying the location of the test.
  3. Fill in the company performing the test along with their contact information, including phone and email. This ensures proper communication regarding the results.
  4. Input the certification number and agency responsible for certifying the test. This adds credibility to your documentation.
  5. For duct tightness, provide details such as square footage of residence, CFM25, fan pressure PA, and flow ring data. Ensure accuracy for compliance.
  6. Complete sections on duct leakage per 100 square feet and specify whether a post-construction or rough-in test was conducted.
  7. In the blower door section, enter CFM50, house PA, fan PA, and air leakage rate. Also indicate type of ventilation used to meet code requirements.
  8. Finally, have a certified person print their name and sign/date at the bottom of the form to attest that all information is accurate and meets regulatory standards.

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In general, for existing homes, a score below 5 ACH50 (Air Changes per Hour at 50 pascals) is considered good, while 3 ACH50 or lower is excellent. For new construction, standards are often stricter.
This is the first metric that results from a Blower Door Test. The airflow, (Imperial in Cubic Feet / minute; SI in liters / second) at a given building-to-outside pressure differential, 50 pascal (Q50). This standardized single-point test allows for comparison between homes measured at the same reference pressure.
If your home is 2000 square feet, a blower door number of 2000 cfm50 is decent (but not especially good). b. If your home was 5000 square feet, we would like to see your number a good bit below 5000, perhaps 3500 or so. Larger homes are often a bit easier to tighten.
Scoring Air Tightness For air changes per hour (ACH), a result of less than 0.6 ACH is considered very good, while anything above 1.5 ACH indicates that there is docHub room for improvement.
The formula is the rate of airflow in cfm x 60 minutes in an hour / volume of the home = number of air changes per hour. As an example, a home had a blower door test of 750 cfm and a calculated volume of 12,000 cubic feet. Using the formula, 750 cfm x 60 minutes / 12,000 cu. ft.

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