Hi everybody, Have learned alot from this forum but I have a specific little problem trying to install an outside air for combustion. I have a Breckwell Big E in the basement, installed with Selkirk vent pipe and flex pipe in the chimney. I would like to install the outside air but can't find anything to adapt 2 to 3 inch pipe. I would like to use 3 inch stove pipe as I have quite a long run up the wall to the outside and then an added few feet so I won't have a problem with snow etc. The Breckwell has a 2 inch pipe and I was thinking of using 2 inch stainless flex pipe for a foot and then adapting to 3 inch regular stove pipe. I don't know what to use to adapt from the 2 to 3 inch pipe. Any suggestions, and maybe I am doing something all wrong. I think the 2 inch flex pipe would fit right on the back of the stove with a clamp but how to adapt after is my problem. I also thought about using pvc pipe but nobody has recommended that so I don't know if that is feasible. Any suggestions would be greatly appreciated!