Need to close 8 inch gap from insert to stainless liner connector

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Burn-1

Burn-1

Feeling the Heat
Jul 13, 2006
446
Lakes Region, NH
After lifting the Summit insert a couple inches off the hearth floor, I will have about an 8 inch gap between the insert and the existing stainless appliance connector from my chimney liner.

I know I can go to the top of the liner and use a couple to add some length but I also have a piece of single wall black pipe that would fit fine as well. Is there any significant galvanic action between the single wall and the stainless that should dissuade me from that easier option?
 
If I couldn't see it I wouldn't use black pipe. If it fails you might not see it until too late. I believe it is also against code in many areas... What is the rest of the liner, rigid? flexible?

KaptJaq
 
KaptJag is right... this is NOT an area to save a few measly bucks or an hour of time, get stainless and preferably it will be the same Dbl wall insulated pipe that exists in your chimney now (with same inside diameter dimensions as the existing pipe). The galvanic action would be minimal from stainless to the black pipe but do this job better then looking for the cheapest/easiest route (its such a small savings its not worth it for this application).
 
I can see it fine. The Summit insert just isn't very tall so I'm trying to close the gap between the existing appliance connector that is riveted on to my 316Ti flexible liner. After a bit more research, it looks like a piece of 316 rigid liner might be the ticket.
 
Bingo, that's much safer.
 
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