What do I do when flex inner liner not pulled over collar fully?
Flex Duct Connections & SupportsPolished core starter — flex/manufacturer check
The inner liner must be pulled over the collar and secured/sealed. The outer jacket is not the air seal.
Field checklist
- Pull insulation/jacket back enough to see the liner.
- Seat the inner liner fully on the collar.
- Secure and seal the liner per approved method.
- Pull insulation/jacket back over after inner liner is right.
- Tug-check gently before ceiling close.
Ask foreman
Is the inner liner fully seated and sealed on this collar before I pull the jacket back?
Do not
Do not clamp or tape only the outer jacket.
Why it matters
If the liner is loose, airflow leaks inside the insulation jacket and the connection only looks finished.
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