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My dryer is vented through a crawl space and as it exits the space it will run up hill. Is this creating a problem by code or will it collect lint and moisture and clog prematurely?

mmathis
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JOE
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  • How long is the entire vent? How many bends? How long is the sloped part, and what's the vertical distance? – Niall C. Aug 02 '17 at 15:51
  • I would think lint balls would be your only issue where it raises. Once a year cleaning that be done on all dryer vents should be good. + up north. – Ed Beal Nov 14 '17 at 15:15

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The International Residential Code (IRC 2009) has no restrictions or requirements for clothes-dryer exhaust ducts to have any pitch, either up or down, although they are also required to conform to the "dryer manufacturer's installation instructions".

Upnorth
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Always run dryer vent piping a at least a 3% grade to the outside to allow any moisture to run to the exterior to the building , " common sense and 55 years in the industry"

olin hardy
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    Hello, and welcome to Home Improvement. Does significant amounts of moisture accumulate in dryer ducting? And, you should probably [take our tour](//diy.stackexchange.com/tour) so you'll know how best to contribute here. – Daniel Griscom Oct 18 '20 at 20:41