wrote in message ...
On Nov 25, 1:07 pm, "spud42" wrote:
wrote in ...
I never said it was. And venting it out a side wall is the
most used option. But I was responding to those who implied
that the existing chimney is a viable alternative for routing the
PVC pipes. From all that I see and know, it's typically not an
option at all.....

There is significant variation between manufacturers and even models
But 3 elbows and Something like 65' or so. 8 elbows may only get you down to 40" not 35
The install manuals I've read cover using existing unused chimney as a option

As far as supports I don't know but typically support requirements for
almost everything are very relaxed when running say through a small chase.
Go take a look at the install manual for a typical gas furnace.
It's very specific, requires the PVC pipes to be supported every
4 ft. No exceptions for a 30 ft run up a chimney. Have you ever
seen a PVC pipe run of any kind the length
of an entire chimney that isn't supported every few feet along
it's run? One that passed a plumbing inspection that is?

it very well specific as in Horizontal runs of vent/flue piping must be supported
also
"The vent can also be run through an existing unused chimney; however,
it must extend a minimum of 12 inches above the top of the
chimney. The space between the vent pipe and the chimney must
be closed with a weather-tight, corrosion-resistant flashing"
Not the best choice But yes it can be done but it's a lot trickier to get right

Link for where that came from?

http://www.goodmanmfg.com/Portals/0/...Os/IO-GKS9.pdf