Flat-oval duct seams split from heat expansion

Thermal movement needs somewhere to go. Replace the damaged section and add the approved expansion/flexible detail if the run is growing under heat.

Round, Spiral & Oval Duct 2nd Year YELLOW

Watch out

Do not smear sealant over a split structural seam and keep the run locked solid.

Check

Inspect how long the seam split is and whether the duct is distorted.
Check if the run is hard-fixed at both ends.
Look for missing expansion allowance or over-rigid supports.
Verify material/gauge/temperature requirement.
Coordinate approved expansion joint or replacement.

Steps

Inspect how long the seam split is and whether the duct is distorted.
Check if the run is hard-fixed at both ends.
Look for missing expansion allowance or over-rigid supports.
Verify material/gauge/temperature requirement.
Coordinate approved expansion joint or replacement.

Say this to your foreman

The flat-oval seam at [location] has split open on the warm discharge run. I checked fixed points and heat movement. Do you want this section replaced and expansion detail added?