Keep equipment in working order with the Mr. Heater 4 In. Stainless Steel Horizontal Vent Kit. Designed for horizontal installation only. Meets Category III venting standards. Please check and adhere to all local codes before installation. Kit includes (1) 4 In. adapter, (1) 45 degree elbow, (1) 4 In. x 12 In. length, (1) 4 In. adjustable length (6-19 In.), (1) wall thimble, (1) 4 In. screened termination tee, (1) Hi-temp 2.8 Oz. silicone, (1) SS screw kit. Other select parts may be required for installation needs. Designed to fit the F260550, F260560 and F260590 Model unit heaters.