I was in a basement today and saw this:
Two electric driers side by side. Each had the standard metal vent pipe
coming out of the driers going to a common T and then the same diameter pipe
running maybe 20 feet, an elbow, another 8 feet, and elbow, and then
Doesn't this sound like an awful long run of vent pipe? And shouldn't it be
a larger diameter pipe where the 2 pipes are venting togethert? And
shouldn't there be t y' where the 2 driers meet? And shouldn't that T be a 4
* 4* larger than 4 (I will guess 7)?
Its a condo association and one member has told me that their set up is fine
as is and was done by licensed plumber...
It all depends on what the dryer makers specs the dryers for. As for
the "T" I am not sure that is a good idea, but frankly I don't know, I have
never had two dryers. Size and length is spelled out by the manufacturer
and included on the install manual.
Since when did plumbers become licenced HVAC techs? Just curious, since that
falls under OUR codes not theirs....under the V part.
And its in the code book for duct work..since its a duct. Clearly states
that they cant share a common..
Dryer Exhaust systems shall be independent of all other systems and shall
convey the moisture and and producs of combustion to the outside of the
building or dwelling.
Thanks! I now have something with a code number on it. I spoke to a friend
who is retired plumber and he was positive that one couldn't put 2 driers on
the same pipe. He said it was mositure related and one could blow mositure
into the other unit.
I do remember reading somewhere that every elbow reduced the run by
something like 5 feet. So with 2 elbows this is just w-a-y off.
I am just a property manager who sees things that seem to amaze me weekly.
On 11/29/2004 7:10 PM US(ET), Steve@carolinabreezehvac took fingers to
keys, and typed the following:
confirms that the dryer venting is either right or wrong, and the OP
does not mention whether the dryer vent has a booster fan installed to
handle the extra length of the venting ducts, but I am having a problem
with the section that you cited as a reference about multiple dryers
venting into the same system. "Dryer exhaust systems shall be
independent of all other systems..."
To me, 'all other systems' means any system 'not a dryer system', such
as exhausts for furnaces, boilers, etc, but maybe my reading
comprehension is different than yours.
How do laundromats handle the exhaust of multiple dryers running all at
once? Does each dryer have a separate vent to the outside, or are they
all piped into one main vent to the outside?
Laundromats have a sep section of the Mechanical code.
A Condo does not fit into that section.
When you have living space, such as in a condo, or apartment building, each
dryer must have an independent vent.
504.7 deals with commercial clothes dryers, and they are required to have
fan motors installed that run all the time , if the business is open, and
/or designed, and installed so that if ONE unit comes on, the fan will run
as long as any unit in any combination is running.
they also must be type 2 dryer units.
The fan motors also have to be outside the airstream.
Does not meet code in our area. Call the city's residentail building
In out area each dryer needs it's own vent. Also the vent needs to be less
than 25 feet. Adding elbows shortens the total run even more.
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