8" vs 6" Flue collar on a VC 1977 Vigilant

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Defiant

Vermont Castings Geek
Hearth Supporter
Dec 5, 2007
2,128
Old Lyme CT
Has any one had any experiece with changing out the 8" flue collar for a 6" and burning this stove? We want to put on the 6" collar roughly 3 feet of pipe with one elbow and use a 6" to 7" increaser into a wall thimble (that is 7" clay) and into an 8"x8" tile chimney about 30' tall. I know using the fire screen will not work , any one see any issues.

Thanks Joe
 
An encore and new defiant work with 6", no one has any experience with this application?
 
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