To do a blower door test they basically turn off all the A/C (geo thermal in our case) close all the air duct vents, tape off our HRV system, open all interior doors, and make sure all windows and exterior doors are closed. The 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. This guy has already done approx. 11 ICF homes in the last week or two and he said that ours was the best reading he had ever done!

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