Insert Install help

[Gary in MD]

Picked up a Century wood insert for the fireplace and have a few questions regarding installation. The existing fireplace flue is 11'' x 11'' and approximately 22' from the top to where I will be connecting to the insert. The damper throat is rectangular with a 6" width, with the plate removed. The insert vent is 6" diameter. I was planning on running 6" SS flex liner to the top of the chimney, but am worried about getting the liner through the damper throat. I have considered purchasing the round to oval (last 5' of liner lenght is ovalized - as referenced here: http://www.arboristsite.com/showthread.php?t=146515

I have also considered just ovalizing the end of a round liner myself with a 2x4. I do not want to cut/grind the damper opening as I am renting the home. Any thoughts on which way to go?

The stock faceplate options will not fit the opening of the firebox properly either. From what I have read the faceplates are primarily decorative anyway, as long as the damper opening is sealed with a block off plate. Instead of using a block off plate, could I just install some high-temp insulation in the remaining portion of the damper opening?

Thanks,
Gary

 

[jasult]

Hi guy. I had to install an 8 inch ss liner with insulation for my Vermont Castings stove and had to use a SAWZALL and remove part of the damper frame and then hammer and chisel to knock some of the firebrick out and now have a straight 8 inch pipe with a clean out tee
ON EDIT I realized you referenced to my post .
As for block off plate, I used some fire board from Lowes. I cut 2 peices and made brackets that rest up over the damper frame and used 2 toggle bolts to tighten the boards and then stuffed fireproof insullation around to make air tight.
here are few pics.
by the way, I consulted a few pro's and this is what they do for the liner to get passed damper
http://www.arboristsite.com/showpost.php?p=2430893&postcount=13

more pics
http://www.arboristsite.com/showpost.php?p=2443962&postcount=16