1:5:10:365 EcoTip Blog

February 14, 2008

:045 Blower Door Test

Suggested Review – :039, :040, :041, :044

Today’s 1:5:10:365 Tip is about another way to test for infiltration coming from unintended places.

inspect1.jpg Blower Door Testing


1:5:10:046 Tip: A blower door is a calibrated fan that can be used to determine the amount of air leakage in a building. It can be used in combination with thermal imaging or a wizard stick to “see” the places where energy is being lost and air quality compromised.

The blower door tests the amount of leakage by blowing a measured amount of air into the home. The pressurization of the home is then measured to determine the amount of air that is flowing out. If air entry points such as doors and windows are closed, then the air that is escaping is exiting through other openings such as can lighting (:044), electrical outlets (:041), and other openings. 

Tomorrow I will talk about air infiltration from garages.


Additional Information

Check with your local public utility. Many offer low-cost or no-cost energy audits including blower door testing, or they may be able to provide a referral.

Additional information about blower doors is included in this this Oakridge National Laboratory document:



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