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Blower Door Test 

The blower door test measures the airtightness of buildings. A blower door is a powerful specialized fan that is placed on an exterior door. The fan pulls air out of the house, lowering the air pressure inside.


A blower door test identifies key problem areas in the home. This process allows us to find all the small air leaks that are causing you to lose energy and waste money.















CFM50 is the airflow from the blower door fan needed to create a change in building pressure of 50  pascals. The most common measure of building airtightness, CFM50 indicates the total air leakage in the building enclosure.



The building or dwelling unit shall be tested and verified as having an air leakage rate of not exceeding 7 air changes per hour. When the CFM(50) is less than 3, mechanical Ventilation installation must be verified by building department.

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