Exhaust Air cannot be used alone to properly dilute air. Which term describes this condition?

Exhaust Air cannot be used alone to properly dilute air. Which term describes this condition?

• A. Exhaust Air
• B. Supply Air
• C. Magnehelic gauge
• D. Smoke Tubes

Answer: (A)

In ventilation, diluting contaminants comes from mixing room air with fresh supply air and then removing air via exhaust. If you only use exhaust air, you’re pulling air out without introducing clean air to dilute the contaminants, which leaves the space inadequately ventilated and can create negative pressure pockets. The term that describes relying on that component alone for dilution is exhaust air—the part of the system responsible for removal, not dilution by itself. Smoke tubes and gauges might illustrate flow or measure pressure, but they don’t define this dilution limitation.

In ventilation, diluting contaminants comes from mixing room air with fresh supply air and then removing air via exhaust. If you only use exhaust air, you’re pulling air out without introducing clean air to dilute the contaminants, which leaves the space inadequately ventilated and can create negative pressure pockets. The term that describes relying on that component alone for dilution is exhaust air—the part of the system responsible for removal, not dilution by itself. Smoke tubes and gauges might illustrate flow or measure pressure, but they don’t define this dilution limitation.