Do not let a round branch duct pull the finished slot diffuser out of alignment.
Check
Check whether the boot moves when the round duct is pushed/pulled.
Square the diffuser to ceiling grid/drywall line.
Add independent support to boot corners or frame.
Relieve duct twist before final fastening.
Confirm diffuser face alignment before ceiling closeout.
Steps
Check whether the boot moves when the round duct is pushed/pulled.
Square the diffuser to ceiling grid/drywall line.
Add independent support to boot corners or frame.
Relieve duct twist before final fastening.
Confirm diffuser face alignment before ceiling closeout.
Say this to your foreman
The slot diffuser boot at [location] is rotating from round duct tension. I squared it to the ceiling line. Do you want independent boot supports/hold-downs added before final?