What do I do when transition from hard duct to flex not supported?
Flex Duct Connections & SupportsPolished core starter — flex/manufacturer check
Support the hard-to-flex transition so the flex does not pull the collar or sag at the connection.
Field checklist
- Check both sides of the transition.
- Support hard duct and flex near the connection.
- Keep the collar round and aligned.
- Verify liner seal after support is added.
- Ask before loading the connection with flex weight.
Ask foreman
This hard-to-flex transition is unsupported. Do you want support added before I connect it?
Do not
Do not let flex hang from the collar like a weight.
Why it matters
Unsupported transitions pull joints open and create leaks/sag.
Search words: flex collar support transition support