How high above the roof should a Type 1 exhaust outlet terminate?

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Multiple Choice

How high above the roof should a Type 1 exhaust outlet terminate?

Explanation:
The height at which a Type 1 exhaust outlet ends is chosen to ensure grease-laden air exits safely and isn’t easily drawn back into the building or into nearby roof equipment. Terminating the outlet 40 inches above the roof surface gives a solid vertical buffer against wind effects, turbulence, and potential re-entrainment, so the exhaust streams upward reliably rather than curling back toward the roof or intakes. It also helps keep the discharge clear of roof debris, snow, or standing water and provides better maintenance access. Lower heights can increase the chance that wind eddies grab the exhaust or that grease deposits accumulate near the roof line, which is why the 40-inch height is specified as the minimum.

The height at which a Type 1 exhaust outlet ends is chosen to ensure grease-laden air exits safely and isn’t easily drawn back into the building or into nearby roof equipment. Terminating the outlet 40 inches above the roof surface gives a solid vertical buffer against wind effects, turbulence, and potential re-entrainment, so the exhaust streams upward reliably rather than curling back toward the roof or intakes. It also helps keep the discharge clear of roof debris, snow, or standing water and provides better maintenance access. Lower heights can increase the chance that wind eddies grab the exhaust or that grease deposits accumulate near the roof line, which is why the 40-inch height is specified as the minimum.

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