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Blower door tests are used to measure the air tightness level of building envelopes, diagnose and demonstrate air leakage problems, estimate natural infiltration rates, estimate efficiency losses from building air leakage, and certify construction integrity.

A blower door consists of a calibrated fan for measuring an airflow rate, and a pressure-sensing device called a manometer to measure the air pressure created by the fan flow. The combination fan and manometer measurements are used to determine the building air tightness. The air tightness of a building is useful knowledge when trying to increase energy conservation or decrease indoor air pollution, or control building pressures.
By depressurizing your home and measuring the rate at which air infiltrates through imperfections in the building envelope, we're able to assess how much energy (and money) is escaping through air leaks. 
The blower door is also used as part of the process to inspect the house with an infrared camera and when running a duct blaster.
We also offer blower door testing as a stand-alone service to test the effectiveness of improvements that have been made to a home.