PelletVent Pro components that come into contact with flue gases are built with an inner wall of corrosion resistant super-ferritic metal. PelletVent Pro is engineered with features for a durable, safe and aesthetically pleasing venting system. PelletVent Pro is a patent-pending venting system for stoves and inserts that use wood pellets, corn, and other biofuels, or oil, as fuel. As a result of DuraVent's cutting-edge manufacturing process and commitment to innovation, PelletVent Pro is uncompromised in attention to detail and performance. This perfect fit and finish is made possible with the laser-welded inner and outer wall. Select components are available in black. PelletVent Pro is now UL listed for 1 in. clearance to combustibles in the USA and in Canada. Its double-wall, air-insulated design offers superior performance. Seams are factory-sealed on all elbows, tees, and fittings.