An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Indoor airPLUS

Does an Indoor airPLUS home need to have a garage ventilation fan?

Installing an exhaust fan in the garage is a good way to help reduce the potential for garage contaminants entering the home. Depending on the ventilation strategy in the home’s conditioned space, it may be a required component. For homes that utilize balanced or supply-only ventilation in the home, a garage fan is not required. For homes that utilize exhaust-only ventilation in the home (such as a timered bath fan), the Rater must perform a pressure test across the garage/house wall or a garage ventilation fan must be installed.