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Install a self-closing door with weatherstripping and thoroughly air-seal the shared house-garage walls to help keep automobile exhaust and other pollutants out of the home.
Installing a garage exhaust fan is one important step in keeping auto exhaust and other pollutants out of the home
The air tightness of the garage-to-house air barrier can be tested with a blower door kit and two manometers
The air tightness of the house-garage air barrier can be tested using a CFM50 test that is run first with the garage door to outdoors closed and then with the overhead garage door to outdoors open