Powered make-up air may be acquired through a duct located within how many feet of an exhaust termination?

Powered make-up air may be acquired through a duct located within how many feet of an exhaust termination?

• A. Within 1 foot
• B. Within 3 feet
• C. Within 5 feet
• D. Within 10 feet

Answer: (B)

When you’re designing powered makeup air for an exhaust, the goal is to balance the air being removed with air being supplied from outside, in a way that keeps the space properly pressurized and prevents contaminants from recirculating. Placing the makeup air duct close to the exhaust termination helps ensure the outdoor air effectively replaces what’s being exhausted and minimizes the chance that makeup air is drawn from interior spaces or other unintended sources. The rule allows locating the makeup air duct within a short distance of the exhaust termination, specifically not more than three feet. This 3-foot maximum keeps the makeup air source effectively tied to the exhaust flow and supports proper ventilation. Distances beyond three feet would fall outside the permitted range. In practice, place the intake as close as practical to the exhaust while complying with other clearance and safety requirements.

When you’re designing powered makeup air for an exhaust, the goal is to balance the air being removed with air being supplied from outside, in a way that keeps the space properly pressurized and prevents contaminants from recirculating. Placing the makeup air duct close to the exhaust termination helps ensure the outdoor air effectively replaces what’s being exhausted and minimizes the chance that makeup air is drawn from interior spaces or other unintended sources.

The rule allows locating the makeup air duct within a short distance of the exhaust termination, specifically not more than three feet. This 3-foot maximum keeps the makeup air source effectively tied to the exhaust flow and supports proper ventilation. Distances beyond three feet would fall outside the permitted range. In practice, place the intake as close as practical to the exhaust while complying with other clearance and safety requirements.