This premium chimney stove pipe length provides a double-wall, all-fuel chimney pipe that is designed for appliances that are tested and listed for use with a 2,100°F HT chimney system. These include wood stoves, fireplaces, or other appliances fueled by wood, oil, coal, or gas. The chimney pipe features a stainless steel inner wall with twist lock connections, creating a lightweight design. Choose between a stainless steel or galvalume outer casing to meet the needs of your installation. To calculate the installed length of 5-8 inch DuraTech Chimney, you must subtract 1.25 inches from each joint overlap of chimney pipe. A minimum of 2-inch clearance to combustibles is required. NOTE: Venting components should be installed by a licensed installer in accordance with local codes and within the manufacturer's specified guidelines as noted in your appliance's installation manual.