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Dryer vent duct

Recently bought a new dryer. When the installer arrived he refused to hook it up saying it is a fire hazard as my existing under the house 10 years old 30 feet vent duct is plastic and laden with lint. I looked up the code and it indeed says it has to be rigid metal and smooth interior wall and limit length to 14 ft. My questions: (1) I need a 30 ft duct but the limit is only 14? What do I do ? (2) I also suppose this kind of metal duct is not easily available from Home Depot. Where can I find it? Or do they have to be custom made? From where? Any idea the cost? (3) my existing dryer vent pipe is a hole on the floor. I suppose the new 30 ft rigid metal duct has to do a 45 degree turn before it can lead to the outside. How can that be done? Your answers will be most appreciated.

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The vent pipe codes are based on the fact that the blower in a typical gas dryer can only 'push' a certain volume of air through a certain sized duct for a certain number of feet. Reduced volume of airflow means higher temperatures thus higher risk of fire.
First option ... is your dryer anywhere near a side wall, which would allow you to shorten the total length of duct required to reach the outside to something less than the 14 ft code limit ?
Second option ... upsize the standard 4" dryer exhaust duct to 6" to compensate for the 30ft length
Either way, in the absence of an external forced draft booster fan ( a.k.a. 'power vent' fan ) you should be using metal exhaust duct not plastic.

Posted on Jul 29, 2013

Testimonial: "Thank you, Tom. Unfortunately my dryer is in the middle of the house and is a long way from the nearest wall. But I found the 4 inch galvanized 5 ft,/ 10 ft duct from a sheet metal shop. They also carry elbow joints. I study the installation Manual comes with the dryer and it clearly sates I can have up to 44 ft of ducting with 2 90 degrees turn, and that's what I am going to do. Hope nobody is coming to arrest me."

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Posted on Jan 02, 2017

Cerfer39
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SOURCE: Question about Whirlpool Dryer venting

http://groups.msn.com/Appliantology/dryers.msnw?action=ShowPhoto&PhotoID=79

Posted on Nov 07, 2007

  • 1122 Answers

SOURCE: dryer fuse and thermistor continue to burn out

how about bypassing the thermistor,you really only need the heater box fuse and high temp. cut out thermostat-mike

Posted on Jul 17, 2009

Controlfrk
  • 304 Answers

SOURCE: How hot is the Vent temp of my new Duet?

It's not the temperature of the air that is the problem. The air is seldom over 160 Deg F. If you have a vent fire the piping needs to last long enough without melting to starve the fire of oxygen in the hopes of extinguishing. Rigid aluminum piping is best suited for this, Rigid flexible is next. The tin foil and white plastic offer little resistance to melting if a fire should begin. The melting would allow the fire to replenish oxygen and support the burning process. The main caution here is to keep your dryer and vent clean...at least annually.

If the duct inside your wall is rigid metal all the way from the dryer to the house exit you need to do nothing to it . Replace the vent between the dryer and the wall with rigid metal 4" piping or hard flexible aluminum piping. If the duct inside your wall is either of the least effective types you need a new run of vent for the dryer to avoid a fire.

You can't use white plastic or flimsy flexible aluminum that feels like aluminum foil when you touch it.

Posted on Sep 11, 2009

Testimonial: "That makes great sence. After closer inspection, plastic flex hose is below the floor. IT WILL BE REPLACED. Great answer. THANKS, Les"

  • 534 Answers

SOURCE: We have just purchased a Lg Dryer #DLE1310W which

lg driers are a 3 prong drier cord receptical he shouldn't have to purchase any other venting as long as the location of the dryer is not in an oddball place The parts included are for basic installation in an area such as the garage or room connected to the garage where the access to the outside is just through a outer wall. Mrs. Leonard good luck on your repairs and hope I helped you some.

Dave

Posted on Sep 16, 2009

jumptrout51
  • 3361 Answers

SOURCE: Have a Kenmore 796.8031 electric

Your duct run will be satisfactory.
No need to insulate it.
If or when you develop a too long drying time remember to check the duct for blockage. It will stop up eventually because of the vertical run.
Metal tape the joints and use suspension straps to stabilize every 4 feet.

Posted on Sep 13, 2010

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It's not the temperature of the air that is the problem. The air is seldom over 160 Deg F. If you have a vent fire the piping needs to last long enough without melting to starve the fire of oxygen in the hopes of extinguishing. Rigid aluminum piping is best suited for this, Rigid flexible is next. The tin foil and white plastic offer little resistance to melting if a fire should begin. The melting would allow the fire to replenish oxygen and support the burning process. The main caution here is to keep your dryer and vent clean...at least annually.

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