Dual Fuel

Model DFS is a Neutral or Negative Draft Venting System for Appliances Burning Gas or #2 Oil. The double wall construction of Model DFS includes a Stainless Steel inner liner, 1/2" air space and galvanized outer casing. Model DFS is listed for use as a Type L Vent, and a Type B Gas Vent. Available in 4", 5", 6", 7" & 8" diameters.