Priority Energy, Blower Door Test, IL

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Air Leakage for Buildings (IECC 2015 R402.4)

Since 2012, blower door air leakage tests have become mandatory tests, regardless of the path chosen for compliance.

The blower door test consists of a large fan, which is installed on an exterior door of the home. The home is depressurized/pressurized to a difference of 50 Pascals, or 0.2 IWC with respect to the outside.  The fan is then turned on to depressurize the home, and the air leakage is measured.

At this pressure, the home should not leak any more than:

  • Climate Zone 4: 5 Air changes per hour (ACH) at 50PA, 5ACH50 under Illinois Energy Conservation Code, and 3 ACH50 under the national IECC code.
  • Climate Zone 5: 5 Air changes per hour (ACH) at 50PA, 5ACH50 under the Illinois Energy Conservation Code, and 3 ACH50 under the national IECC code.

This blower door test should be performed when the house is completely finished. We like to tell our builders that when the cleaning crew is at the house, it’s the perfect time for a blower door test.

At Priority Energy, we are approved to provide blower door leakage tests nationally. Our testing crew is RESNET and/or BPI certified and is recognized by the state of Illinois as a testing agency. Read about Air Leakage tests for existing homes and buildings.

To schedule your Blower Door test, get in touch or call 800-737-2299 today.

If you would like to see how we've helped builders pass blower door tests across the chicago land area - see our results page!

  • Thank you again and you will be the first person I call if I need additional part or service from your company.
  • I just wanted to send this message to all you and say GREAT JOB!  We had a rough inspection today and passed for the Woodward Ave. house. The inspector told us "if every house I inspected looked like this one I would be out a job".

    Anonymous Builder
  • We were so impressed with the amount of information the Priority Energy technicians gave us during our ENERGY AUDIT.  If you are buying a house, I would strongly recommend having them do an energy audit on it, in addition to your usual home inspection.

  • Thanks for a super intelligent and deep seminar expertly handled by a staff which was a pleasure to be around. Lunch was superbly and subtly handled.

    A.S. Architect
  • I wanted to thank you for all of your extra time and energy during our BPI training over the last few weeks. You really helped put things in perspective. You are an awesome crew and your facility is a valuable resource for students and the community

    BPI Student, L.E.
  • There is much less dust in the house and the monthly gas and electric charges have been reduced by 10 to 15%.....I'm sure I will see greater savings over a twelve month period......thanks again.

    Aeroseal Client, R.N.
  • Just completed my BPI Field exam for my Quality Control Inspector (QCI) certification renewal at Priority Energy.
    Such a convenient and well-set-up training and test center with caring and knowledgeable staff and proctors! Thanks folks!


    P.R., Ottawa, IL
  • It's been cold here for the past few days and I really feel the difference in heating since the building was Aerosealed! My apartment is so much warmer now. Thank you Priority Energy!


    Miruna; Tenant at Country Manor Apartments, Peru, IL
  • Anytime I can be a reference for all the great work on my (new) house, please let me know.  Priority Energy is outstanding at what they do!

    Executive at Medline Industries, IL

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The newly constructed CVS Pharmacy at the corner of Roosevelt Rd and Park Blvd in Glen Ellyn, IL meets Illinois' energy efficiency requirements and is ready for occupancy!  Priority Energy recently completed the mandatory IECC Blower Door test on the 38,000 s.f.