Metalbestos gives you the safe, efficient, and cost-effective venting system that's engineered precisely for pellet and corn burning stoves. Model VP Pellet Pipe has been tested and listed by Underwriters' Laboratories, Inc., in accordance with UL -641 Standard for Low Temperature Venting Systems, as well as the applicable requirements from UL -103 Standard for Residential Type and Building Heating Appliance Chimneys. Model VP Pellet Pipe, when installed according to Metalbestos installation instructions, complies with National Safety Standards, such as NFPA -211. The system is rated for flue temperatures up to 570°F. Available in 3 and 4 diameters. Full line of fittings and full range of pipe lengths increase installation flexibility. Proven coupling joint connects in seconds to assure joint integrity. Gasketed joint design. Painted pipe lengths available for interior use. Inner wall 304 stainless steel, outer wall paintable galvanized. Rolled-over male end eliminates sharp edges. 3 clearance to combustibles. Removable tee cap for inspection and cleaning. Internal spacing bead assures uniform insulating air space between pipe walls.