Class A pipe is also known as Chimney Pipe or UL103 Pipe. Class A systems are used for high-temperature exhaust gases from common solid fuels such as: Wood, Coal, Oil, and other high-output fuels. This pipe is meant to be installed as a free-standing chimney system and can be connected to your stove or appliance without the need for an existing chimney. DuraChimney II is a double wall, air-cooled chimney system for use with masonry fireplaces which burn wood, oil, coal, or gas. DuraChimney II is designed to stay cool on the outside, to provide a hot draft on the inside and to provide a fire-safe design that protects both the chimney and the building. The double-wall, air-cooled designed allows the chimney it expand both radically and lengthwise under high temperatures.Use as wall support for chimney system Supports up to 30 of DuraTech Chimney Attaches to chimney pipe Can be installed above or below the tee If installed below the tee, a short section of pipe is requiredCollection: DuraTech Depth: 15-1 8 Fuel Type: Coal, Gas, Oil, Wood Inner Diameter: 10 Material: Galvanized Pipe Class: Class A Pipe Shape: Round Style: Functional Vent Construction: Double Wall Weight: 17 Width: 14