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Blower Door Test: 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. 
The blower door is a powerful fan that is mounted into the frame 
of an exterior door. The fan pulls air out of the house, lowering the 
air pressure inside. The higher outside air pressure then flows in 
through all unsealed cracks and openings.
Since leakier houses require more airflow to induce a given pressure 
difference, blower doors can measure the relative 
leakiness of a house. 
A blower door test will measure failures in air boundaries, 
failures that left uncorrected will continue to leak both air and dollars.
click here to find more about Energy Audit tests
Your House works as a system and everything is connected / diagram/

What to Expect from Home Performance with ENERGY STAR  /pdf brochures/

Matt Slattery - Building Performance Specialist

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