What is the maximum ventilation rate for a two-car residential garage?

What is the maximum ventilation rate for a two-car residential garage?

• A. 100 CFM
• B. 200 CFM
• C. 300 CFM
• D. 250 CFM

Answer: (B)

Ventilation rates for attached garages are set to dilute vehicle emissions without wasting energy or creating pressure issues that could pull fumes into the living space. For a two-car residential garage, the maximum allowed ventilation rate is 200 CFM. This level provides enough air exchange to dilute exhaust gases from two cars while keeping energy use reasonable and avoiding excessive drafts that could affect indoor air quality. Rates lower than this may not adequately dilute pollutants, while higher rates exceed the specified limit and aren’t necessary for typical two-car garages.

Ventilation rates for attached garages are set to dilute vehicle emissions without wasting energy or creating pressure issues that could pull fumes into the living space. For a two-car residential garage, the maximum allowed ventilation rate is 200 CFM. This level provides enough air exchange to dilute exhaust gases from two cars while keeping energy use reasonable and avoiding excessive drafts that could affect indoor air quality. Rates lower than this may not adequately dilute pollutants, while higher rates exceed the specified limit and aren’t necessary for typical two-car garages.