Flex Duct Maximum Length

Max length allowed for this flex run to diffuser? Pull tight or leave slack?

I'm checking flex duct maximum length at [location]. I found flexible insulated duct connecting main duct to diffuser or boot. Max length allowed for this flex run to diffuser? Pull tight or leave slack?

Flex Duct, Boots, Collars & Grilles 1st Year YELLOW

Stop if

Hold point on flex duct maximum length: I have the location, photo, drawing/detail, and what was checked. Who should verify before this gets cut, covered, lifted, sealed, energized, or signed off?

Watch out

Don't exceed code maximum (typically 6 feet supply per IMC). Don't install with kinks. Don't use as permanent substitute for hard duct.

Check

room/grid/area
photo of condition
drawing/detail
manufacturer/model if visible
what I already checked

Say this to your foreman

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