Excessive sag creates friction
Sagging flex creates friction and can collapse the liner. Support it cleanly before it becomes a hidden airflow complaint.
Watch out
- Do not leave a belly of flex above ceiling and hope TAB can balance it out.
Check
- Look for low bellies between supports.
- Check whether the sag is also creating a kink at the boot/collar.
- Add approved supports with enough width to avoid pinching.
- Keep the run smooth and direct.
- Ask if the run should be shortened or changed to hard duct.
Steps
- Look for low bellies between supports.
- Check whether the sag is also creating a kink at the boot/collar.
- Add approved supports with enough width to avoid pinching.
- Keep the run smooth and direct.
- Ask if the run should be shortened or changed to hard duct.
Say this to your foreman
This flex has a low sag between supports at [location]. Do you want another support or a shorter route before cover?
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