Do not leave thin sharp straps digging into round duct.
Check
Look for dents, cuts, or shiny rub lines where strap touches duct.
Check whether strap edges are raw/sharp.
Verify duct size and approved round support method.
Support the run before removing damaged straps.
Patch/replace any duct skin that has been compromised.
Steps
Look for dents, cuts, or shiny rub lines where strap touches duct.
Check whether strap edges are raw/sharp.
Verify duct size and approved round support method.
Support the run before removing damaged straps.
Patch/replace any duct skin that has been compromised.
Say this to your foreman
The hanger straps at [location] are cutting into the round duct skin. I checked the contact points. Do you want approved saddles/heavier bands installed and the damaged skin repaired?