Blower Door Test for Homes?

Are you a Contractor Building a New Home 🏠 and in need of a Blower Door Test?

According to the IECC, the test should “be performed any time after creation of all penetrations of the building envelope have been sealed.” Basically, the home should be as close to being complete as possible, with exterior penetrations sealed properly and all the drywall completely installed, before carrying out the a blower door test.

Any leaks caused by an incomplete building envelope could potentially affect the test results. That’s why the full building envelope needs to be sealed before an accurate test can be conducted.

A blower door test is a procedure that involves using specialized equipment to measure the exact air tightness of a home. Depending on the region of the country, a maximum air leakage rate is defined, and each new home must meet this air tightness level.


During a blower door test, a calibrated fan is installed in a sealed door or window while all other exterior openings are closed. The fan is placed in the main entry doorway to depressurize the house or suck out air from the interior. This process causes outside air to be drawn into the house through leakage points. 


Here are some reasons for Needing a Blower Door Test :

  • Reducing energy consumption from excess air leakage
  • Avoiding moisture condensation problems
  • Avoiding uncomfortable drafts caused by cold or warm air leaking in from outside
  • Controlling outdoor contaminants, pests, and odors from entering your home
  • Determining proper sizing and air flow requirements of heating and cooling equipment
  • Determining whether mechanical ventilation is needed to provide acceptable fresh air and maintain indoor air quality in your home


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