> If you ever do have a fire, Plenum wire will not > release poisonous gas into the air and hopefully allow you to escape the > building relatively unharmed. > Hah! I'm sure your going to be really worried about what fumes may be coming out of the furnace vent, if you have a fire in your house. I might be more concerned, say, with the fumes coming out of the couches, or PVC pipe, or 1 million other things that make up a house and release all sorts of noxious things when they burn. I would tend to try to keep wires routed like this in the cold air returns, rather than the heat lines, to minimize the risk of them melting :)