How far away should air intake openings be from contaminant sources located within 10 feet?

The correct answer indicates that air intake openings should be situated at least 3 feet away from potential contaminant sources. This distance is specified to minimize the risk of drawing in pollutants, gases, or other harmful substances that can adversely affect indoor air quality.

When determining placement for air intakes, it is essential to keep them at a safe distance from sources of contamination such as exhaust vents, dumpsters, or idling vehicles. If the intake is too close — like within 1 foot — it would be more likely to pull in these contaminants into the building, which could lead to health issues for occupants, increased maintenance costs, and potentially decreased efficiency of the HVAC system.

Placing air intakes at least 3 feet away provides a buffer zone. It helps ensure that contaminants dispersed through natural ventilation or movement of air do not directly enter through the intake, thereby promoting a healthier environment. Standards and best practices in the International Mechanical Code reflect this reasoning to enhance the overall efficiency and safety of HVAC systems.