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