Not a good idea. Rear vent would be better. It probably will draft poorly and spill smoke with a 90 right off the top connected to a horizontal run. As noted earlier you need a full liner.Back to square one here is what i am proposing; wood stove in front of fireplace; 90 degree angle pipe from top of stove to fireplace; once pipe is in fireplace 90 degree angle up current chimney and a few feet of wood stove pipe up the chimney and leave it at that.
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