I have an older 2 story home and the main chimney is used only for exhausting the furnace. I want to run conduit from the basement to the attic to get eletric, cable, and phone lines to various rooms on the second floor. Can I run conduit up through the chimney chase if I stay as far away from the chimney as possible? Even if I commit to never using that chimney for anything else? Can someone explain the details of why you should keep wires from the chimney chase? Specifically, does the purpose of the chimney matter? Does distance from chimney matter? Does PVC vs metal conduit matter?