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Apprentice answer

Why did the slot diffuser boot rotate after connecting the round branch

2nd YearRound, Spiral & Flat Oval DuctStandard Correction

Anchor the boot/diffuser independently so duct twist does not control the finished ceiling line.

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Plain-English answer

Round branch duct can put twisting force into a light plenum boot. If the boot is not independently supported, the diffuser line rotates and looks sloppy in the finished ceiling.

Loosen the connection, square the slot with the ceiling line, add approved boot support/hold-down clips/wires, and reconnect the duct without twisting tension.

Ask 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?

Verify before acting

Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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