Selkirk 3"x6" Pellet Stove Pipe, Type L Vent. It is tested and listed to UL-641 and UL-103 standards. This pipe features a proven coupling joint that connects in seconds to assure joint integrity, a gasketed joint design, and a double wall design with 1/4" airspace. The inner wall is made of 304 stainless steel, the outer wall is paintable galvanized, and the rolled over male end eliminates sharp edges. It has a 1" clearance to combustibles and is suitable for pellet burning stoves.