ok guys i bought a harman add on wood furnace 2 years ago still not hooked up im going to do this now. My question is the flu i have a red brick chimney in my house and it does not have a liner my question is can i install the 6 inch black pipe as a liner through the chimney all the way up to top of chimney? I do have some class a chimney pipe that i want to later use for a seperate chimney system im not ready to do yet. Any help would be helpful my gas furnace doesnt vent out this brick chimney either just hot water tank.