rerouting furnace exhaust

[Tony Estrada]

Hi. I would like to reroute my furnace's exhaust piping but I don't know if
I will be breaking any codes/rules or more importantly creating a dangerous
situation.

The furnace currently sits in a crawlspace in the basement, right under the
living room. The exhaust piping runs up through the floor of the house in
the corner of the living room, up through the ceiling, and through the roof
comes out a metal pipe about 8" diameter and about 3 feet high from the
shingles to the top of the pipe.

In the living room the piping runs up on a corner of the room and is
surrounded by sheetrock wall/studs (and probably lined with some metal
heatshield stuff).
Example (o=pipe, -|+=wall):

xx deck xx
+-+------------+
|o| |
+-+ |
| |
| |
| |
| |
| |
| |
+--------------+

What I would like to do is to reroute the exhaust piping to run outside of
the house directly from the basement (about 3 feet above ground) instead of
up through the living room wall. The reason for this is that I would like
to open up the living room wall as much as possible and place patio doors to
a deck that is being built out back. So it would look like this:

xx deck xx
+--------------+
| |0
| |
| |
| |
| |
| |
| |
| |
+--------------+

The questions are:
1) Is it safe to run the exhaust pipe uncovered outside of the house?
2) Does building code allow this? What should I look out for?
3) Do I need to make some kind of housing for the pipe so that it is not
exposed?
4) Will the extra length of piping in the basement pose any threats? (the
furnace sits in the middle of the basement and I want the pipe to come out
off the right wall of the basement - about 13 foot run)
5) Do I need to provide a stack up to the heigh of the roof + 3 feet, or can
the exhaust near where it exits the house?

Your input is greatly appreciated. Thank you!

-Tony

PS. remove the _N_O_S_P_A_M_ to reply via email.

[CBHVAC]

You are going to need to check with local codes.
Here, we cant do that....but in other counties, we have seen it done...but
in my humble opinion..it aint safe.
But then...what you have sounds strange as well..
the 8 inch pipe sounds like overkill from hell, as most are happiest to keep
condensation forming with a 3 or 4 inch pipe..or a 4 inch that narrows down
to a 3 inch down the line.

With a power vent, you might be able to do this..again...call the local
inspection office, and check. You may also find that a licienced contractor
has to do the work, as in some areas, homeowners are NOT allowed to modify
duct, or any type of vent dealing with the furnace. Also, if its not an
inducer type of furnace, I would leave it as it is..
Thats going simply on your posting...thats all..cant see the full situation,
or other alternatives from our perspective.

"Tony Estrada" <testradav_N...@yahoo.com> wrote in message
news:a7g7um$cj8$1...@localhost.localdomain...