A splitter damper blade breaks loose inside the duct
A loose splitter blade can rattle, block airflow, and damage the duct. Locate it, stop unsafe operation if needed, and access/secure/remove it with foreman approval before patching the duct correctly.
Do not leave a loose splitter blade rattling inside the duct because air is still moving somewhere.
Check
Confirm which branch/zone lost air and where the noise is coming from.
Check damper handle/regulator position outside the duct.
Use an existing access point, register opening, mirror, or camera before cutting if possible.
If cutting access, mark the patch size/location and avoid damaging liner, wiring, controls, or rated assemblies.
Patch, fasten, and seal the opening per approved method after repair.
Steps
Confirm which branch/zone lost air and where the noise is coming from.
Check damper handle/regulator position outside the duct.
Use an existing access point, register opening, mirror, or camera before cutting if possible.
If cutting access, mark the patch size/location and avoid damaging liner, wiring, controls, or rated assemblies.
Patch, fasten, and seal the opening per approved method after repair.
Say this to your foreman
There is a loose splitter/damper blade rattling inside [duct/branch] and [zone] has low/no air. I checked the regulator and access options. Do you want me to open an access patch and secure/replace the hardware?