Originally Posted By: rhjelmeland
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I recently performed an inspection which turned up what I perceive as a fire hazard. The dryer vent exhaust line was ~20ft long and suspended in the crawl space over a single floor joist cross braceing. The end result is that the very long dry exhaust line looked like a piece of Christmas Garland. My concern is that the long run plus the two “sags” in the line could trap lint, and in the long run this may result in combustion. In our area the local fire inspector determined that a similar situation resulted in the a fire which destroyed a home that was used as a childs day care.
Some basic research informed me that most dryers can only drive 15ft with 2 elbows without a secondary fan.
Does anyone know of codes/regulations that govern the length and type of material used for dryer vents?