Blower Door Test

Blower Door Test

Professional energy auditors use blower door tests to help determine a home’s airtightness. A blower door is a powerful fan that mounts 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. These tests determine the air infiltration rate of a building.

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