Relocating Furnace Chimney
My furnace chimney is currently a double-walled stainless pipe that runs straight up from the basement furnace, through two floors of living space, through the attic, and out the roof.
I’d like to have the chimney exit the roof about 15 feet to the south of the current location. Would I be looking at drafting problems, etc., if I added a section of horizontal pipe in the attic to exit at the new location? The new section wouldn’t be truly horizontal, as it would angle from the current location at attic floor to the new location at the roof peak.
Is there such a thing as an integral fan that could be installed within the chimney to assist with the draft, if necessary?
The furnace is about 12 years old, oil-fired, fairly high efficiency (the exhaust is warm but not super hot). The attic is unheated.
Thanks much for any insight.
Allen
Replies
Bump
Also -- thanks, rez, for the bump.
You do lose some draft with a horizontal run or wirth elbows. The height of your stck helps. You can also add an inline power assist wire with timer delay to come on with ignitor and shut off a few minutes after flameout
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There are tables to calculate such configurations - they'll look at BTU, input, temp; horizontal run and vertical run ; and flue diameter.
It seems likely you'd be OK
An HVAC contractor should have the appropriate tables for oil.
Be sure to have the draft checked and the barometric damper properly set.
(Topically, it'll be set to 0.02 water column inches, but check with the manufacturer specs.)
I don't see may barometric dampers as I'm in nat gas country, but I wouldn't trust the little scale on the damper itself - I'd have it checked with a draft gauge.
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Thanks, Bob and Piffin, for the info.
Allen