What do I do when using narrow strap that pinches flex?
Flex Duct Connections & SupportsPolished core starter — flex/manufacturer check
Use support that cradles flex without pinching it. Narrow straps can collapse the duct.
Field checklist
- Look at strap width/contact point.
- Replace narrow/pinching support with approved wide support/cradle.
- Keep flex round at the support.
- Add support spacing as needed.
- Recheck airflow path.
Ask foreman
This strap is pinching the flex. Do you want a wider support/cradle here?
Do not
Do not cinch flex tight with narrow strap or wire.
Why it matters
Pinched flex reduces area and airflow.
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