Thanks for all the help and guidance. I learned a lot from this site. Overall things went well and now I am just waiting for some cold to try it out. After seeing the 2400 sitting in the firebox, I probably could have fit the larger 3100 but did not want to have to shoe-horn it in there. Also my 2400 exhaust collar lined up better under the damper than the 3100 AND the BTU ratings were not much lower on the 2400. I just hope it can warm up my 2,200 sq ft 50's ranch nicely. The unit is in the center of the house so I am quite hopeful. It turned out well and looks nice in the living room.
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