Annular Space And Angles
Wrong clearance, missing angles, no expansion allowance
Red / Stop And Verify3rdBatch 4
What This Helps With
Wrong clearance, missing angles, no expansion allowance
Apprentice words: annular space
Trade terms: annular space, retaining angles, expansion clearance
Check First
Listed annular space and retaining angle detail
What Not To Do
Skip retaining angles
What can go wrong: Caulking the gap solid where clearance is required
Better Foreman Question
What annular space/angle detail does the listing require?
Verify With
Reference type: NFPA 90A
Source to verify: Manufacturer listing; NFPA 90A; AHJ
Safe wording: Annular space, sleeve clearance, and retaining angle overlap must follow the listed damper installation sheet and AHJ direction.