I'm removing a wood burning fireplace and the chimney runs out the back of my house and on up. I have removed the chimney but the hole through the wall is a little rough and a bit larger than the 7 inch diameter. What i thought might be a solution would be to get a 7 inch cap with a flange that has a 2 inch or so lip on it that would cover the hole in the wall. If that does work where might I find a flange like that? What do you guys think? Any suggestions are welcomed.Thanks.