New to forum and have a couple of questions. I'm installing an Englander 30NC this weekend in my pole barn. I have 2 - 36 inch fixed length sections of stove pipe and one adjustable length (38 - 68 inch) section. My first question is does it make any difference if the adjustable section is attached to the stove or the ceiling box? Second question is moving the adjustable section. Probably a dumb question, but I took the adjustable section out of the box and I can't get the sections to move. Does it have to be connected to the stove or ceiling box in order to slide? Thanks