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I reckon dryers are trickier than I thought for most folks. People seem to have a hard time understanding that the dryer vent is absotootly, posilootly critical to the safe and efficient operation of your dryer! Period. Folks, if your dryer vent sux, then your dryer's performance and safety will suck, too. It's just that simple. The idea with a dryer vent is to have as little back pressure as possible. Back pressure retards the flow of moist air outta the dryer and also collects lint in the dryer and vent system creating a fire hazard. And, hear this, poor venting will cause dryers to overheat, too! Another great cause of dryer fires.
The number one thing you should do to make your dryer safer to operate and dry clothes more efficiently is to follow the do's and don'ts in this chart. Look at this figure carefully. I didn't put the link there just to look purdy. Examine it, study it, memorize it, print it out and sleep with it under your pillow...well, maybe not. But you get the idea.
In addition to the basic do's and don'ts above, you shall obey these dryer vent length criteria. You like your overly-long dryer vent just the way it is? Ok, Slick, here's your future.
Note that white vinyl vent hoses are not UL-Approved and are a great way to start fires in your house. The American Household Appliance Manufacturers Association (AHAM) recommends the use of either rigid aluminum or steel duct or spiral-wound aluminum flex hose--NOT the white vinyl hose. For any dryer, but especially gas dryers, white vinyl vent hose should never be used. If yours has this installed on it, replace it ASAP with UL-approved materials. Examples of UL-approved dryer venting materials are shown here. If you need to upgrade your vent using UL-Approved materials, some recommended items are listed below. Hint: these are links, you can click 'em to see pictures of 'em.
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 fire starters. Polyesters are particularly pernicious fire 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.")
Ok then.
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