What do I do when flex run too long for intended use?
Flex Duct Connections & SupportsPolished core starter — flex/manufacturer check
If the flex run is too long for the intended use, stop and ask whether the hard duct route should be extended.
Field checklist
- Measure the actual route.
- Compare to plan/shop intent.
- Identify why flex is long: hard duct short, diffuser moved, obstruction, or layout change.
- Ask before using flex to solve a layout problem.
- Document if route changed.
Ask foreman
This flex run is longer than intended. Do you want hard duct extended or a shorter route?
Do not
Do not use long flex to hide a bad layout.
Why it matters
Long flex can damage airflow and make TAB harder.
Search words: flex collar support run length