I'm replacing a 20+ year old upflow gas standing pilot furnace that is
located on a wall adjacent to the garage. The new furnace will not use the
old chimney so I could connect the old furnace from the other side of the
wall. Rather than toss it out, I might as well use it as a garage heater.
It would only be used by myself and shut-off when I'm finished.
dont fudge with the exhaust! Carbon Monoxide!
In any case, most furnaces exhaust heat isnt
that hot anymore about 10 feet down the line.
If its a high efficency unit, they dont even
need steel ductwork, they just use PVC.
Lots of small electric heaters out there that would
do the job safely...
Opps sorry, shouldnt have said ductwork....
(most refer that to the heated side of the house)
I was referring to 4" to 6" exhaust.
Hi Efficency units have issues sending their
exhaust up and out the chimeny because the
temperature that comes out of the furnace is
too low. (you need heat to get a decent
draft up and out of a chimeny)
So allot of new HI Eff. units just use PVC pipe routed
to the outside of the house.
I am almost sure it is going to be against code. They are kind of funny
about breaking the fire barrier between the home and the garage as well as
providing a nice source of ignition if you have a gasoline leak in the
Yes they are, and frankly I don't think they are much of a problem, but
I don't have the facts. I have heard of local codes that prohibit them, but
I have no idea of how common that may be. Thanks for pointing that out and
allowing me to clarify my statement.
It's not against code to have a heat duct into the garage; it is
against code to have a return in the garage if it's the same furnace
that heats the house. That isn't what's being discussed. The only
code issue here is that the return to the furnace isn't allowed to be
within 6' of the firebox if it's an open combustion unit.
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