One of the ways that dryers can start household fires is by igniting the excess lint that accumulates around the motor, burner shroud (for gas dryers) and cabinet interior. Y'see, Slick, lint is composed of very small, dry clothing particles which includes cotton and polyesters--both very good fires starters. Polyesters are particularly pernicious fires starters and are very difficult to extinguish once they ignite. Polyesters, vinyl in particular, pose another fire hazard when used as vent hoses, which we'll talk more about later in this article.
One of the biggest causes of vent hose fires is when this accumulated lint inside the vent hose ignites. Lint gets caught in the folds and creases and sticks there because of the humidity. Over time, the lint builds up to such a degree that the dryer cannot exhaust properly. This results in increased drying times initially and, ultimately, in a fire. Once a fire starts in a vinyl vent hose, the hose itself ignites and burns vigorously creating a fire that is very difficult to extinguish.
Another reason for using rigid, smooth-walled aluminum ducting for your dryer vent is that you can easily clean it out using a vent brush. You need to do this annually to keep your dryer running at optimum efficiency and to ensure that you won't get any lint fires started inside the dryer vent. Oh yeah, it can still happen even with aluminum duct but the results will be far less catastrophic than a white vinyl vent fire.
Folks, I don't make this stuff up. I couldn't make this stuff up even if I wanted to. If you're having dryer problems like long dry times and overheating, you need to check out your venting in accordance with foregoing pearls of wisdom.
I can't even tell you how many time I hear Grasshoppers tell me, "My dryer is (circle one) [overheating, runs too long, fires the heaters only briefly, smells hot, blah blah blah] and I checked the vent and it's OK." Checked the vent and it's OK? Checked the vent and it's OK? Well, just what in the hell does "OK" mean? What criteria are you using to check the vent? Do you even know what to look for? (Hint: the answer to all the above is "I didn't know but now I do after reading your inspiring and illuminating Appliantology article on the subject, oh wise Samurai.")
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