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Sheet Metal Journeyman Practice Test

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Given a machinery room ventilation system that terminates on the roof and an outside grille serving an air conditioning system in the penthouse, what is the minimum clearance between the discharge outlet and the intake for the air conditioning system?
Correct Answer:
20 ft
Explanation:
The key idea is preventing exhaust from the rooftop machinery-room discharge from being drawn back into the penthouse air intake. When the exhaust vent and an outside air intake sit near each other, especially on a roof with wind shifting plumes, the discharged air can be recirculated into the AC system, degrading air quality and reducing efficiency. A twenty‑foot minimum spacing provides enough buffer for the exhaust plume to dissipate SAMPLEaway from the intake, making backflow unlikely under typical conditions. Distances smaller than twenty feet don’t reliably prevent recirculation, while twenty-five feet would exceed the required minimum. So, twenty feet is the correct minimum clearance.

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