I have heard of venting a furnace out of the basement with a PVC pipe
instead of a chimney for a gas furnace (propane and natural gas). I
can't get natural gas where I live, but I want to look into the option
of venting the oil furnace out of the basement instead of using a
chimney (several reasone for not wanting to use the old chimney which I
don't want to bore ou with) . Is it at all possible to exhaust an oil
furnace out of the basement with a pipe (I'm guessing if the answer is
yes it would have to be a stainless pipe) undergound and venting into
the yard as is done with some gas furnaces? Also, could this setup be
retro-fit on an oil furnace that is about 10 years old, or only on the
newest more efficient oil furnaces?
Rob NE Pennsylvania, USA, Earth
the only appliances I know of that are vented through PVC are new, and power
Your oil furnace is probably not able to be retrofitted to do this. Seek
professional help before attempting.
Sorry I have NEVER seen a furnace vented into a yard. Please provide details
Uniform Building Codes that I am ware of require vents to be above the roof
top so the fumes and CO are not ingested.
I will answer in case the HVAC guys are at a party.
Only modern furnaces with a secondary heat exchanger are eligible for using
PVC as the exhaust.
All older furnaces that I have encountered require a stack that terminates
above the roofline.
Oil furnaces are a different critter. I would GUESS that any flue that
meets the guidelines in the furnace manual would work. A non-masonry
chimney should be an option.
For you safety use whatever you learn in this group as a guideline and
consult with a local HVAC person experienced in oil furnaces before you
You can't vent the oil furnace you have with PVC. You need to use either a
Field or Tjernlund 'power venter'. There are specific guidelines for their
placement, and the wiring can be complicated for a novice. You can use
standard galvanized smoke pipe going to the power venter, but they are just
another mechanical component that can break over time. If you have an
existing chimney, get it repaired or replaced. A chimney liner or a complete
new double-walled chimney for an oil furnace must be stainless steel.
Hmm. I have a galvanized double-walled chimney, and a ~10"
galvanized pipe leading to it. When I replace the furnace, 26 years
old, will I have to replace either the chimney (which is deeply stuck
into the house) or just the pipe that winds around the furnace to it?
Remove NOPSAM to email me. Please let
me know if you have posted also.
This is one that you need to check with your local permit office, and an
inspector...the IBC, and IFC says no.
you COULD use a power vent to go to your sidewall.....and I promise you one
thing....if your tech isnt tuning your furnace right each year, you will
know it in short order.
not on your older furnace. it doesn't burn clean enough. and it
routinely requires a hot exhaust updraft discharge up a chimney to
specified feet above the rooftop.
you're probably looking at a 99 percent efficient combustion of gas on
those pvc ground level flues.
i searched google for "high efficiency oil heat pvc flue"
and came across a good article about how much maintenance they save
with a change:
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