oil boiler convert from power vent to chimney #2

My last thread got hijacked, so I am posting again...
I have a Weil-McLain boiler (5 years old) and it is vented with a power vent and intakes combustion air from inside (basement).
I am installing a fireplace on the main level and will be building a chase for the chimney on the outside of my house. I was thinking this would be a good time to convert my power vent to a real chimney for long term durability as I could share the chase with both chimneys. I don't know if this is feasible though since my boiler is not located real close to the location of the fireplace. The boiler vent would have to go 6 feet horizontal, then right angle and another 12 feet horizontal then vertical for 25ft chimney height. Of course when I say horizontal, I mean it could go at an incline when it is horizontal. I would have a professional do all of this, but was curious if this is even possible, or would I screw up the drafting and cause condensation/soot problems?
Trying to educate myself before I call the pros. I really don't like the powervent due to noise/smell outside the house. I could build a new chase right above the boiler just for the boiler vent, but that would be more money and time...trying to avoid.
Thanks.
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On 22 Dec 2005 06:13:11 -0800, snipped-for-privacy@yahoo.com wrote:

If the boiler is a total of 18 feet offsett from where you want the fireplace, then I'd say, no it's not a good idea to try to share the stack with the chimney. (Probably possible, but not a good idea) I'd say either put the new fireplace closer to where the boiler is, move the boiler, or use two stacks.
My personal preference would be to re-think where the fireplace goes, and stick it on an interior wall, but your floor-plan or budget may militate against that.
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