The DuraPlus 6 x 9 Galvanized Class A Triple Wall Chimney Pipe Length is designed for appliances tested and listed for is used with wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas. 6, 9, and 12 chimney pipe has 1 insulation blanket 24, 36 chimney pipe has 1 2 insulation. To calculate the installed length of DuraPlus chimney pipe, subtract 1 1 2 from each length of chimney pipe.ADA Compliant: No Collection: DuraPlus Fuel Type: Coal, Gas, Oil, Wood Length: 9 Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 6 Pipe Shape: Round Style: Functional UL Listed: Yes Vent Construction: Triple Wall Weight: 5 Width: 10