I'd like to install an old wood stove in my house. The chimney is in good condition (brick w/ clay tiles) but the flue is extremely narrow. Is it generally a good idea/OK to remove a couple of the bricks in the flue to allow the vent pipe to pass through? I'm thinking at the least I'd have to take out 3 bricks, at most 7. Pretty sure the pipe is 6" and I want to run it all the way to the top.