All depends on how big the furnace room.
Have my sump in mine with no problems with either moisture or heat fluctuations but then it's probably 10x10" plus the crawl space under the landing and stairs. As for combustion air, my furnace draws direct from outside as it's HE unit but if wasn't, it's code to have a combustion air intake line anyway, plus would also get air exchange from tank.
Last edited by mark; 03-19-2007 at 09:33 PM.
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