Grease duct is being hung level and may need slope
Stop before the grease duct gets welded, wrapped, or closed in as a flat run. Verify the approved grease duct detail, slope direction, cleanout/drain requirements, and support elevation before continuing.
Do not leave a grease duct run flat, backpitched, or with a belly because it “looks close enough.”
Check
Confirm system is kitchen exhaust/grease duct, not normal exhaust.
Check the approved detail for slope direction, cleanout, drain/reservoir, access, weld/seal, and support requirements.
Measure start and end elevations before final welding/wrap/inspection.
Look for low spots where grease could collect.
Document any section already hung level before moving forward.
Steps
Confirm system is kitchen exhaust/grease duct, not normal exhaust.
Check the approved detail for slope direction, cleanout, drain/reservoir, access, weld/seal, and support requirements.
Measure start and end elevations before final welding/wrap/inspection.
Look for low spots where grease could collect.
Document any section already hung level before moving forward.
Say this to your foreman
The grease duct run at [location] is being hung level/backpitched. I checked the detail and it looks like slope/drainage needs verification before we continue. Do you want me to hold and reset the hanger elevations per approved direction?