M G Duravent 6DT-48CF 6 Inch x 48 Inch Duratech Factory-Built Length 430-alloy Inner Line Galvalume Outer Wall has been filling the supply and accessory needs of over 8, 000 sweeps hearth retailers masons and contractors for over 25 years. has the privilege of serving over 80% of the professionals in America.Founded by Robert Daniels Sooty Bob in 1978 has grown from a one-man operation to a national network of six warehouses and a manufacturing plant. From its headquarters in Fairfield Iowa plays a major role in providing for the industry. Designed for appliances that are tested and listed for use with a 2100 F HT system, such as wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal or gas. Tested to UL test procedures 103 HT 2100 F and listed under UL re-examination service number MH 7399. Available in stainless steel (SS) or in a galvalume (GA) outer-casing and stainless steel inner wall with twist-lock connections. This is a Class A . To calculate installed length of 6 DuraTech , subtract 1 1/4 from each joint overlap of pipe. Important: Allow a minimum of 2 air space to combustibles when installing DuraTech . Stainless Steel best suited for outdoor weather conditions DuraTech pipe is designed for appliances that are tested and listed for use with a 2100 F HT system, such as woodstoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas. The DuraTech System is designed to stay cool on the outside and provide a hot draft on the inside. A fire-safe design protects both the and the building. To calculate installed length of 5 , 6 , 7 , or 8 DuraTech , subtract 1 from each joint overlap of pipe. DuraTech Light-weight insulation and sleek 1 wall design, combined with twist-lock fittings, provides for easy installation. No locking bands or mechanical fasteners required.