Correct Liner Type

New member after lurking for few weeks,
First - thanks to those that have been there, done that, are so willing to share their experiences and ideas. It's been really educational and making this refurb doable.
So here's what I've concluded/planning after determining I have extremely poor performance and ultimately safety concerns.
I have a 10"x10 1/2" clay liner in an "exterior" chimney. This is a dual flue chimney as the house has a fireplace in basement and on upstairs floor. I'm working the basement side first. I say exterior as it actually is built in the attached garage. Heating unit is a Fisher Insert, older model with chain operated damper and 7 1/2" insert outlet. Insert is in very good condition IMO and has all new fire bricks in the fire box.
I'm going to start the cleaning and damper removal today to allow for a block-off plate install, I'll approach damper removal slowly and determine if I want/attempt to remove the entire assembly enough to pass a new S.S. Liner.
The above is no cost so I'm proceeding, but here is the basis of my post - soon I'll be breaking open the wallet, read post after post and honestly a bit unsure regarding liner make and type. I'll go with 8" flex, with 1/2" full insulation. Looking for others opinion on brand of liners (manufacturers), staying away from double liners as I hear they can be easily damaged. Also material type 316, 316Ti, etc. once I get that nailed down, then what boot adapter, Rockford cast or sheet metal formed, know I have to notch for damper rod just looking for opinions or preferences.
I don't have much room (2-3") above the insert when installed to make the final connection so I'll have to assemble then slide the insert in and do the final bolting to insert top at that point.
Appreciate what the Fisher group thoughts are.
Thx's
Mike

bholler said:

For an old stove like that you want a heavy wall liner304 is just fine no need to pay for 316. Are you sure you need 8" most fisher inserts we do only need 7" what is the inside diameter of the outlet opening?

Click to expand...

As noted above the inside diameter of the insert outlet is 7 1/2", guess reducing by 1/2" is not going to significantly affect performance and I can see where it would ease installation as 8" with an additional 1" total on liner insulation would only give me about 3/4" total clearance when installing the liner.
Appreciate the input on 304 vs 316 SS. These are the type of things I just not 100% sure of. I'll start pricing 7" and associated attachments. Would you have Any preference on the SS or cast boot adapter - thinking the SS should work. Just thought Rockfords cast had the option of 10 or 30 degree outlet angle.

Thx'
Mike