Help with Stove Pipe Clearences

I have 2 questions about stove pipe clearences...
1) I have a gas (LP) furnace in the basement. We're doing some re-construction on the first floor and eliminating the closet that the flue currently goes through. This pipe does NOT get very hot, just warm to the touch. I notice that there is wood about 1" away were it passes through the roof. I'd like to box this pipe in to discuise it as a column. Can this be done safely?
2) We also have a large fireplace with 2 seperate flues. There is a "pie plate" covering the one not used by the fireplace, but it's within a couple of inches of the ceiling (wood). I'd like to use this for a wood stove, but the clearences all say 24" minimum. I'm not sure how this was used in days gone by, but it was. Any ideas?
Thanks in advance, Rick
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No. If you want to do that, replace the furnace with a 90% and then, the flue is made of PVC pipe and you can do just about anything you want with it.

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