When is it OK to use flex duct for dryers?

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Old 08-30-09, 05:07 PM
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When is it OK to use flex duct for dryers?

Hi,

I run into a problem where the last pieces of my dryer duct work to the outside became loose. Essentially, I can't reconnect an adjustable bow piece that connects on the outside to the vent outlet. However, I do think I have a chance if I pushed it aside and used some flex duct for the last turn. Is this legal (Code)?
 
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Old 08-30-09, 05:43 PM
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Metal flex, probably. Plastic flex should be outlawed, and probably is. Don't know where you live, so you need to clear the code thingy with your authorities.
 
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Old 08-30-09, 06:01 PM
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Metal vent ducting is the only version actually labeled for dryer use.I also understand many insurance companies either require it or may penalize you if you don't use it.Same with metal washing machine hoses.
 
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Old 08-30-09, 06:13 PM
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I'm in the Chicago burbs.

I figured, how bad can it be since the metal flex ducts seem to be Ok to connect a dryer to the wall.

spdavid, are you referring to plastic or metal metal flex duct?
 
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Old 08-30-09, 06:47 PM
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Insurance companies would prefer you use metal.Plastic tubing no longer is labeled for dryer use.
 
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Old 08-30-09, 07:36 PM
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flex ducting of any kind builds up lint way to quickly, most fire marshalls recommend only ridgid ducting for dryers. Sorry about that. also plastic is to likely to melt and cause a fire especially with gas dryers.
Murpy was an optimist.
 
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Old 08-31-09, 05:41 AM
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How about that sturdy type of metal flex duct?
Doing a google I cam across flex metal type that is sturdier than the foil one.

BTW. if I have to reattach the metal pipe I have to open the house....
 
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Old 08-31-09, 08:57 AM
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Any ducting with a corrugated inside will hold lint.The type you found is less problematic but still you'll have to take it apart and clean it out every so often.

If it's the type you pull to lengthen,the less it's pulled out the less area there is for lint build up.
 
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Old 09-08-09, 06:44 AM
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Our codes here ( and this may be from the National Fuel Gas Code) requires dryer ducting to be smooth interior wall. The only exception allowed is up to six feet of flex to connect the appliance to the wall.
 
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