i've been told numerous times by the dryer instructions, home depot,
etc. to use clamps to hold the dryer ducting in place.
however, it is also recommended to use metal ducting (vs. plastic/foil
ducting) to limit a potential fire hazard from lint.
how am i suppose to use clamps with something so rigid as the metal
should i just use tape instead to hold the metal ducting in place? is
this a fire hazard too???
Us metal duct tape. That is NOT the same as the cloth stuff, even if
the cloth stuff that looks sort of like metal. You will find it in the
heating and A/C section. It is more expensive, it has a backing that needs
to be peeled off and it will work much better and much longer.
Also don't use flexible pipe.
Hmmmmmmm, that's all I have ever used, and it worked fine. Of course
there's always pop rivets, and they dont penetrate as much, but are
harder to remove to clean the pipe. That's why I prefer screws, and
just use short ones.
Of course there is always the other option. No ducting at all. I
have never used ducting on my electric dryer. In the winter, that's
free heat that would be blown outside. In the summer my wife hangs
the clothes outside. A broom and dustpan is needed every month or so
to clean up the lint behind the dryer, but that little chore is worth
the free heat.
WARNING: Do not vent into the house if you have a gas dryer !!!
You got it backwards. The SCREWS are NOT needed all that is needed is
the proper TAPE.
Those who track such things UL, insurance companies and fire departments
tell us that screws are a fire hazard. I follow their advice. They have no
reason to make this up.
i put my dryer in and used straight sections of metal tubing from
homedepot... i also used some metal hose clamps.. to hold the metal
pipes... did not see any problem with doing it....it worked fine....
First, plastic dryer vent duct is now illegal. On a gas dryer its always
You can use a short section of metal duct, flex, designed for a dryer, but
never over 14 feet. Anything over 14 feet is asking for it later.
The sections of KD, or knockdown, or as you might know them as, ridgid pipe,
are held together with metal tape, and then covered with mastic for high
Never use a screw in it.
I agree that is it unsafe and a poor idea, but I was not aware that it
was illegal. Do you know what authority (in the US) has outlawed it. I
still see the stuff offered for sale as dryer vent and I would like to bring
it to the attention of those selling it that it is illegal if I can verify
International Mechanical Code has outlawed it. It would be up to the local
code enforcement to handle it.
The local Lowes, HD, and other big box stores, along with many of the
smaller chains, have a notice back in their dryer section, around the
ducting that clearly states that its been outlawed, and that it is also
Local codes may vary, and you may, or may not be able to run the metal flex
at all to the unit, but most will allow it here.
International Residential Code 2000, Chapter 15, Exhaust Systems
Dryer exhaust systems shall be independent of all other systems, shall
convey the moisture to the outdoors and shall terminate on the outside
of the building. Exhaust duct terminations shall be in accordance with
the dryer manufacturer's installation instructions. Screens shall not
be installed at the duct termination. Exhaust ducts shall not be
connected with sheet-metal screws or fastening means which extend into
the duct. Exhaust ducts shall be equipped with a backdraft damper.
Exhaust ducts shall be constructed of minimum 0.016 inch thick ( 0.406
mm) rigid metal ducts, having smooth interior surfaces with joints
running in the direction of air flow. Flexible transition ducts used
to connect the dryer to the exhaust duct system shall be limited to
single lengths, not to exceed 8 feet (2,438 mm) in length and shall be
listed and labeled in accordance with UL 2158A. Transition ducts shall
not be concealed within construction.
M1501.3 Length limitation.
The maximum length of a clothes dryer exhaust duct shall not exceed 25
feet from the dryer location to the wall or roof termination. the
maximum length of the duct shall be reduced 2.5 feet for each 45
degree bend and 5 feet for each 90 degree bend. The maximum length of
the exhaust duct does not include the transition duct.
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