What do I do when not sealing collar before insulation jacket?
Flex Duct Connections & SupportsPolished core starter — flex/manufacturer check
Seal and secure the collar/inner liner before the insulation jacket hides the connection.
Field checklist
- Pull the jacket back.
- Confirm liner is on collar.
- Secure/seal liner first.
- Then bring insulation/jacket back over.
- Recheck after diffuser/boot movement.
Ask foreman
Do you want me to verify the inner liner seal before pulling the jacket over this collar?
Do not
Do not cover an unverified collar connection with insulation jacket.
Why it matters
Once covered, a bad collar connection can look good until airflow fails.
Search words: flex collar support seal sequence