Hi, I am installing a Englander 25-PDV where I currently have a wood stove with 8" Chimney. I realize I can buy a 3" - 8" adapter and connect at the ceiling support box. My question is....What is the best, easiest way to remove the existing pipe from the stove to the support box. I loosened screws and there doesn't seem to be much play to move the pipe sections. None of the pipes are adjustable. Do I need to get a sawzall or something and cut out a section of pipe to begin the disassembly? Help....Thanks!