Hey Guys, I am moving this question from my "new guy" thread. I have three pipe flus in my house that are in a wooden structure. One flu is for the furnace, one flu is for the fire place and the third flu is not used. The third unused flu comes out in the cellar near the furnace. I want to put in a wood burning stove and I was considering putting it in the cellar or in front of the fire place. My question, are either of the flu pipes in these pics double walled stove pipe adquate for a wood stove?? They both appear to be "double walled" but I dont see any insulation. Dont know if that matters. Any pipe info appreciated. Lets here from you pipe gurus! Thanx guys. The top of the unused pipe that comes out in the cellar with the cap off Where the pipes comes out in the cellar The three flu structure The top of the fire place flu, the center cap. The fire place flu with the cap lifted. It is like a six inch center pipe with what looks to be about six inches of clearance all the way around to the outside pipe. That seems like a HUGE clearance to me. The ugly fire place.