Flex Duct Maximum Length
Flex duct has code-limited maximum lengths to prevent excessive pressure drop.
Stop if
- Max length allowed for this flex run to diffuser? Pull tight or leave slack?
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
- Maximum flex length per code/spec?
- Pulled tight or sagging?
- Kinks or sharp bends?
Steps
- Maximum flex length per code/spec?
- Pulled tight or sagging?
- Kinks or sharp bends?
Say this to your foreman
Max length allowed for this flex run to diffuser? Pull tight or leave slack?
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