True or False: A grease duct with an 80-foot length must be sloped at 1 inch per foot.

True or False: A grease duct with an 80-foot length must be sloped at 1 inch per foot.

• A. True
• B. False
• C. Cannot determine from information provided
• D. Not applicable to this installation

Answer: (A)

The key idea here is gravity drainage for grease ducts. Horizontal grease ducts must be sloped so that any grease, oil, or condensate can drain toward a collection point or drain rather than pooling in the duct. For long horizontal runs, the slope is specified to maintain a continuous drain path along the entire length. Using a slope of 1 inch per foot provides a consistent and reliable drop, ensuring grease won’t accumulate and that cleaning and maintenance are effective. So for an 80-foot horizontal grease duct, maintaining that 1 inch per foot slope is required to meet proper drainage and fire-safety considerations.

The key idea here is gravity drainage for grease ducts. Horizontal grease ducts must be sloped so that any grease, oil, or condensate can drain toward a collection point or drain rather than pooling in the duct. For long horizontal runs, the slope is specified to maintain a continuous drain path along the entire length. Using a slope of 1 inch per foot provides a consistent and reliable drop, ensuring grease won’t accumulate and that cleaning and maintenance are effective. So for an 80-foot horizontal grease duct, maintaining that 1 inch per foot slope is required to meet proper drainage and fire-safety considerations.