DuraVent 4 in. Dia. x 24 in. L Galvanized Steel Double Wall Stove Pipe (Pack of 2)PelletVent is a complete venting system from DuraVent for stoves and inserts that use oil fuel or multi fuels (including wood pellets, corn, cherry pits, switch grass, coffee husks, walnut shells, soybeans, wheat, sunflower hulls, rapeseed and sugar beets). The adjustable double wall chimney stove pipe adds 310 inch to a rigid vent pipe and fits most standard piping. Its double wall, air insulated design offers superior performance and reliability for