Round Gas Vent Collection Aluminum 90 Degree Adjustable Elbow with 3 Inch Inner Diameter This Aluminum 90 Degree Adjustable Elbow with 3 Inch Inner Diameter from the Round Gas Vent series is a Type B gas component and consists of the duralock system for a tight seal. Offsets obstructions as needed. Elbows (3”-8”) swivel 360° at base. 90° Elbow is adjustable from 0° to 90° in sizes 3”-10”. Elbows must be supported when installed. Features: Fuel Type: Gas, Liquid Propane Inner Diameter: 3" Elbow Angle: 90 Degrees Offsets Obstructions as Needed Double Wall Construction UL Listed DuraVent Type B Gas Vent is designed to meet the rugged demands of the job site. The inner wall is recessed to eliminate damage in handling. DuraVent's innovative system for a lock-tight connection for Type B Gas Vent called DuraLock. See the alignment indicators meet; feel the ends grasp together; hear the snap as the connection firmly locks into place. Type B gas vents are not suitable for use with wood-burning or coal applications, industrial ovens, exhaust ranges and hoods, grease or pollution ducting, or as free-standing exhaust vents for high temperature applications. Type B Gas Vent has been engineered to heat up rapidly. It remains hot during the operation of the appliance with minimal condensation in the appliance and vent system. Pipe lengths are available in multiple lengths, 6 to 60 inches, with a full complement of adjustable and rigid fittings. 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.