DuraTech Collection 6" Class A Chimney Pipe Adjustable Stainless Steel Wall Strap Warranty Notice: M&G DuraVent warranty applies to this professional grade product only when installed by a trained professional installer. The DuraTech 6" Class A Chimney Pipe Adjustable Stainless Steel Wall Strap is used in interior or exterior installations to add lateral support to the chimney. Assures a 2” to 6” clearance to combustible walls. Required every 8’. Features: Inner Diameter: 6" Outer Diameter: 8" Adjusts from 2"-6" Total Width: 11-3/4" Required every 8 Feet With a Thermal Tech blanket insulation encased between dual walls, DuraTech offers the optimum in safety and performance. It keeps the outer wall of the chimney cool, while ensuring high flue gas temperatures for optimum draft performance. 5”-8” DuraTech is a double-wall, all-fuel chimney system for use withwood stoves, fireplaces, furnaces, boilers, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas, and zero-clearance fireplaces thatare factory-built. Looking for Simpson Dura-Vent? You found it! Simpson Dura-Vent has changed their name to DuraVent. DuraVent is a recognized technological leader in the venting industry. Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting. The company's research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for PelletVent Pro. Scientifically proven materials and unequalled engineering make DuraVent products not only the best choice, or safest choice, but the only choice for professional quality venting products.