Again, this is a down flow furnace out of a mobile home. Just noticed
it says "Sealed Combustion" and my insurance company said it's OK for me
to use it in my garage. Down flow, so I'll weld a stand for it to sit
up off the floor about 8".
Question about flue exhaust and fresh air inlet. This is an 80% unit
(I'm guessing 57K BTU's out divided by 70K BTU's in = 81%? )
Can this be used with the flue exhaust/air intake being terminated on an
outside wall similar to 90% units but metal, not PVC? Or must this flue
go a certain number of feet higher than the roof? Or something in
between the two?
Normally mobile home means "direct vent" with sealed combustion. This means
a specialized vertical vent termination would be the only one you could use.
I see manuals you can "buy" online; such as this one;
but I would think that there would something in the way of "free" from the
You may want to try these folks, because they surely know all about that
You may have to call or e-mail, but I'm not sure they will help an
individual for retail sale, as they are wholesale suppliers to the mobile
If you are going to have to wing-it all alone, you may want to try a gas
fireplace vent kit and termination. But that may be quite risky, both for
safety and functionality.
Dang, for $15 I'd be happy to buy a manual, but mine isn't offered.
I forgot to mention before that there is a blower for the combustion
air. It's before the combustion, not sure if that is still called a
"power vent" or not. Either way, with the blower it's not as if it
needs to rely on a great natural draft.
When I had something similar in my trailer (80 percenter)
the flue gas went up through the roof, and then six inches
or so more. Thre was assembly up there to keep the rain out.
I'd suggest a similar set up. I used indoor air for the
combustion. There was a bit of a hole in the floor, so it
drew air from under the trailer for the combustion.
Of course, the manufacturer is a good idea. But, it sounds
reasonable. Flue gasses too hot for PVC. Needs metal, but
you wrote that below.
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