Shasta Vent 6" x 36" Class A, All Fuel, Double Wall, Insulated, SS Chimney Pipe 6" Dia. x 39" Length Shasta Vent HT Chimney. A Class A, Double Wall Chimney system; 304SS inner and outer walls with High Temp ceramic blanket between the walls. Typically used for Venting Residential Wood Stoves, Fireplaces and Furnaces; All-Fuel rated including wood, oil, coal, natural gas, and propance appliances; Listed by Intertek Laboratories to the HT standard of UL 103; Limited LIfetime Warranty; Superior Draft Performance.