ACPI Physical Security Assessment Practice Test

Outdoor air intakes are critical components in building ventilation systems, and their positioning is vital for ensuring that the air entering the building is clean and free from contaminants. Locating outdoor air intakes at a sufficient height above grade helps in avoiding the intake of exhaust from nearby buildings, contaminants from ground-level activities, and other undesirable airborne particles.

Impacts such as vehicle exhaust, dust from construction, or pollution are more prevalent at lower elevations. By positioning air intakes at 12 feet above grade, which is generally considered a best practice, the risk of drawing in these pollutants can be significantly reduced. This height allows for better air quality and encourages more effective ventilation, ultimately leading to safer and healthier indoor environments.

Other options—6 feet, 9 feet, and 15 feet—do not strike this balance as effectively. While 15 feet may provide a buffer, it might be unnecessarily high for most urban environments where 12 feet adequately mitigates the risks. Therefore, 12 feet is the recommended height for maximizing outdoor air quality while maintaining practical installation considerations.