All air handled by a direct-fired makeup air heater shall be taken from ______.

All air handled by a direct-fired makeup air heater shall be taken from ______.

• A. the outdoors
• B. the space being heated
• C. the dining room
• D. the kitchen

Answer: (A)

Makeup air is the fresh air that replaces air exhausted from the building, helping maintain proper pressure and indoor air quality. A direct-fired makeup air heater is designed to condition outdoor air before it enters the space, so all air it handles should come from outdoors. Using outdoor air ensures you’re supplying fresh air rather than recirculating stale indoor air, which would fail to meet ventilation needs and could create IAQ and pressure problems. Air drawn from inside the space or from a specific room (like a dining area or kitchen) would not provide the required fresh ventilation for the whole building.

Makeup air is the fresh air that replaces air exhausted from the building, helping maintain proper pressure and indoor air quality. A direct-fired makeup air heater is designed to condition outdoor air before it enters the space, so all air it handles should come from outdoors. Using outdoor air ensures you’re supplying fresh air rather than recirculating stale indoor air, which would fail to meet ventilation needs and could create IAQ and pressure problems. Air drawn from inside the space or from a specific room (like a dining area or kitchen) would not provide the required fresh ventilation for the whole building.