Powered make-up air _____.

Powered make-up air _____.

• A. Replenishes the air expelled from a building with recycled air from the building's HVAC system
• B. Replenishes the air expelled by a mechanical exhausting device
• C. May be acquired through a duct that is located within 3 feet of a mechanical exhaust termination
• D. Must be electronically interlocked with a building's environmental air exhaust system

Answer: (B)

Powered makeup air is used to replace the air that is removed by a mechanical exhaust, helping to maintain proper building pressure and ventilation. The best choice directly describes this function: it replenishes the air expelled by an exhausting device. By introducing outdoor air to compensate for what exhaust fans remove, makeup air prevents negative pressure, supports indoor air quality, and helps ensure safe operation of supply and combustion systems. The other statements aren’t universal truths about makeup air: using recycled indoor air isn’t how makeup air typically works, proximity rules from a single distance aren’t a universal requirement, and interlocking with the exhaust system isn’t a standard obligation in all codes.

Powered makeup air is used to replace the air that is removed by a mechanical exhaust, helping to maintain proper building pressure and ventilation. The best choice directly describes this function: it replenishes the air expelled by an exhausting device. By introducing outdoor air to compensate for what exhaust fans remove, makeup air prevents negative pressure, supports indoor air quality, and helps ensure safe operation of supply and combustion systems. The other statements aren’t universal truths about makeup air: using recycled indoor air isn’t how makeup air typically works, proximity rules from a single distance aren’t a universal requirement, and interlocking with the exhaust system isn’t a standard obligation in all codes.