How do you fix a linear slot plenum box that will not fit because the ceiling framing is tight

Plain-English answer

Linear slot diffuser boots have to fit the architecture and still move air. If framing squeezes the plenum box, smashing the boot creates airflow restriction, noise, and ugly finish coordination.

Check the print, framing dimension, diffuser location, collar clearance, and plenum volume. The likely recovery is a revised narrow/asymmetric boot, trimmed flanges where allowed, a shifted framing member, or a custom taller plenum that preserves airflow without rattling against finish work.

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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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