What size is the chimney pipe?

The Teton, Pioneer, Wilderness, and Big Sky Wood Burning Fireplaces use a 12” double wall air cooled pipe. This pipe has a 15” outside diameter and requires 2” of clearance to combustibles on all sides. The Sawtooth, Selway, and Yellowstone Gas Fireplaces use direct vent 5’x8” pipe which requires 2” of clearance to combustibles on all sides. See the owners’ manual for more information.