Help with correct furnace exhaust PVC

Posted by Stormin Mormon on November 2, 2009, 7:36 am

Might need to put a 45 degree angle piece on the exhaust, to
help shield from rain.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

Could the water in the pipe have come from outside? There
should be no way for
it to do that, make sure there isn't.

Posted by Art Todesco on November 3, 2009, 7:33 am

Stormin Mormon wrote:

> Might need to put a 45 degree angle piece on the exhaust, to
> help shield from rain.
>

Actually, on mine, the installation
instructions require a 90 on the
output. I asked why. The rep said it
was to prevent wind from
causing back pressure in the combustion
area. He said this could
cause the unit to shut down. And he
said, a 45 was not
adequate because air could still blow in.

Posted by ransley on November 2, 2009, 7:05 am

> My furnace stopped working, it had some read-outs saying the exhaust
> was not working.
> Turns out the exhaust pipe was full of water and filled the exhaust
> fan with water.
> I cleaned all of this out, but now I want to correct the problem.
> My exhaust PVC travels from the furnace to the outside wall. =A0There is
> a belly in this pipe. =A0Thats were the water was sitting.
> Looks like I need to have it angled to drain back to the furnace - I
> need to correct the belly.
> Is there a standard size for this type of pipe? Mine looks to be 3"
> dia. =A0Rather large.

I would think it should angle to drain outside or what about rain.

Posted by Jules on November 2, 2009, 10:52 am

On Mon, 02 Nov 2009 04:05:36 -0800, ransley wrote:

>> My furnace stopped working, it had some read-outs saying the exhaust
>> was not working.
>> Turns out the exhaust pipe was full of water and filled the exhaust
>> fan with water.
>> I cleaned all of this out, but now I want to correct the problem.
>> My exhaust PVC travels from the furnace to the outside wall. There is
>> a belly in this pipe. Thats were the water was sitting.
>> Looks like I need to have it angled to drain back to the furnace - I
>> need to correct the belly.
>> Is there a standard size for this type of pipe? Mine looks to be 3"
>> dia. Rather large.

>
> I would think it should angle to drain outside or what about rain.

I assume they're supposed to drain toward the furnace so that no exhaust
gas can get trapped at a high point in the system (in which case having a
pipe that bottoms out partway through might be a bad thing anyway) - it'll
always clear to the atmosphere.

Ours currently vents outside at about 3' off the ground via a 90-degree
elbow which keeps moisture out, although I think according to building
codes (we don't really have any where I am) it's supposed to vent at roof
height (which seems like common sense anyway - I'll fix ours sometime)

cheers

Jules

Posted by Bob F on November 2, 2009, 5:28 pm

Jules wrote:

> Ours currently vents outside at about 3' off the ground via a
> 90-degree elbow which keeps moisture out, although I think according
> to building codes (we don't really have any where I am) it's supposed
> to vent at roof height (which seems like common sense anyway - I'll
> fix ours sometime)

That's certainly not true here in Seattle. There do have to be certain
clearances from openable windows, doors, or air intakes.

Page 3 of 4 < 1 2 3 > last >>

Similar Threads	Posted
Need a sealant for my furnace exhaust	January 14, 2008, 10:03 pm
Are birds in high-eff furnace exhaust common?	October 21, 2005, 5:36 am
Question about high efficiency Furnace Exhaust	January 16, 2007, 10:48 pm
Does high efficiency furnace have to exhaust out of roof?	May 10, 2007, 6:06 pm
leak around base of furnace exhaust pipe	January 4, 2008, 11:57 am
Wire a furnace blower to use as workshop exhaust fan?	February 23, 2008, 6:35 pm
Carrier high-eff furnace exhaust fan screech	March 16, 2008, 9:43 am
Water pooling around base of furnace exhaust pipe	January 9, 2008, 1:23 pm
Dryer exhaust and bathroom exhaust distances	May 19, 2008, 8:57 am
Roof exhaust fan with too much exhaust	October 1, 2006, 6:02 am

Help with correct furnace exhaust PVC - Page 3