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Dryer exhaust duct extension Darro 10-14-2006
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Posted by on October 14, 2006, 12:51 pm


I'm looking for comments and suggestions on whether it's safe and
practical to run 20 feet of 4" metal exhaust duct horizontally from my
relocated clothes dryer to tie into an existing 4" dryer duct which
runs about 20 feet vertically. The existing vertical duct is
uninsulated and is inside an always-warm house without air
conditioning.

Thanks in advance for your replies.
Darro

Posted by RBM on October 14, 2006, 1:17 pm


I would check with the manufacturer, they have specifics as to how long and
how many bends are acceptable. You can always get a dryer duct booster fan


> I'm looking for comments and suggestions on whether it's safe and
> practical to run 20 feet of 4" metal exhaust duct horizontally from my
> relocated clothes dryer to tie into an existing 4" dryer duct which
> runs about 20 feet vertically. The existing vertical duct is
> uninsulated and is inside an always-warm house without air
> conditioning.
>
> Thanks in advance for your replies.
> Darro



Posted by tbasc@bellsouth.net on October 14, 2006, 2:05 pm



Darro wrote:
> I'm looking for comments and suggestions on whether it's safe and
> practical to run 20 feet of 4" metal exhaust duct horizontally from my
> relocated clothes dryer to tie into an existing 4" dryer duct which
> runs about 20 feet vertically. The existing vertical duct is
> uninsulated and is inside an always-warm house without air
> conditioning.
>
> Thanks in advance for your replies.
> Darro

In addition to checking with the manufacturer for duct length,
consider lint accumulation and clean outs.
TB


Posted by Bob M. on October 14, 2006, 2:23 pm



> I'm looking for comments and suggestions on whether it's safe and
> practical to run 20 feet of 4" metal exhaust duct horizontally from my
> relocated clothes dryer to tie into an existing 4" dryer duct which
> runs about 20 feet vertically. The existing vertical duct is
> uninsulated and is inside an always-warm house without air
> conditioning.
>
> Thanks in advance for your replies.
> Darro

The problem with extra-long runs is the fan inside the dryer may not be able
to push the air that far, especially after a year or so & the tube gains
some wind resistance in the form of lint that catches on things on the
inside of the vent (this is why you don't screw dryer vent tube sections
together). Wind resistance is also one reason why the flexible vinyl hose
is not recommended (the other being it can catch on fire).

Check with the mfgr, see what they say about maximum vent length.



Posted by hallerb@aol.com on October 14, 2006, 2:29 pm


longer length means less efficent drying more energy use, adds regular
maintence cleaning out line, and isnt a good idea.

would a NEW vent be shorter, if so install a new one.


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