Mechanical · M-VTD4Q

Flexible Duct Connection to Ceiling Grille

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A flexible duct connects to a ceiling grille with a variable neck size, secured by a drawband with sealant, UL-approved tape, or a factory metal collar screwed and sealed to the duct. A manufacturer-installed balance damper or flag damper with a ribbon is integrated into the run where applicable. The maximum length of the flexible duct is five feet. Hangers tied to the structure above comply with SMACNA standards. For T-bar ceiling applications, diffusers are positively attached using lay-in support clips or mechanical fasteners secured to the T-bar runner.

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