DuraPlus 6 '' Class A Chimney Pipe Chimney Cap with Spark Arrestor The DuraPlus 6 '' Class A Chimney Pipe Chimney Cap with Spark Arrestor is required where chimney pipe terminates preceding the roof line. removable screws for cleaning of the chimney and spark arrestor screen. of unstained steel. : internal Diameter : 6 '' outside Diameter : 12 '' Height : 7 '' Comes with Spark Arrestor Screen Material : unstained Steel DuraPlus is designed to stay caller on the extracurricular, to provide a calefactory draft on the internal, to boost stove efficiency, and to provide for a fire-safe design that protects both the chimney and the building. This triple-wall chimney two insulating layers -LRB- instrumentality blanket, plus air space -RRB-. The instrumentality blanket insulation is securely in position, eliminating calefactory spots common with loose-fill type insulations. In the event of a creosote fire, the compressible blanket insulation the chimney liner to expand outwardly in a straight line direction. DuraPlus Chimney is a triple-wall, all-fuel for use with wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or different appliances fueled by wood, oil, coal, or gas. for Simpson Dura-Vent ? . You it ! . Simpson Dura-Vent has their name to DuraVent. DuraVent is a recognized technical in the venting industry. Consistently the to market with hot innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent patents for respective products and continues to design innocuous and technologically late venting. The company 's into solving problems with corrosion, when biofuels such as as corn are used, led to the break-through patent for PelletVent Pro. Scientifically proved materials and alone engineering DuraVent products not lonesome the best choice, or safest choice, but the lonesome choice for paid prize venting products.