Return air openings should not be located within which types of spaces?

Return air openings should not be located in closets and garages due to several critical reasons associated with safety, health, and system efficiency.

In closets, the potential for air contamination is a concern. These enclosed spaces often contain personal belongings, clothing, and potentially hazardous materials, which can lead to the accumulation of dust, allergens, or other pollutants. Drawing air from these areas into the HVAC system could lower the air quality throughout the building.

Garages present unique hazards as well. They often contain vehicles, fuel, and various chemicals, which can emit harmful vapors and fumes. If return air openings were installed in a garage, there is a risk that these contaminants could be pulled into the living spaces of the home, creating health hazards for occupants.

By avoiding return air openings in these particular spaces, the integrity of the indoor air quality is maintained, ensuring that only clean, safe air is circulated throughout the building. This practice aligns with health and safety provisions within the mechanical code, which aim to foster a safe and comfortable indoor environment.