Selkirk 104084 Rv Adjustable Length Type B Gas Vent Pipe 4 Inches 18 Inches

Product Description

The Selkirk 104084 is a 4-inch RV Adjustable Length gas vent pipe section measuring 18 inches, designed for use with Type B round gas vent systems. This component is a core part of the MetalBest RV line, engineered for residential and light commercial gas appliance venting applications. The adjustable design allows the pipe section to extend from 6 inches up to 16 inches, giving HVAC technicians and installers the flexibility to hit an exact required vent length without cutting or custom fabricating additional sections. When used in combination with a straight vent length, this piece ensures a precise fit every time. The 4-inch measurement refers to the inside diameter of the pipe. The outside diameter runs approximately one-half inch larger, which is standard for the RV line. The outer shell is constructed from 28-gauge galvanized steel, providing durable corrosion resistance in both indoor and outdoor venting environments. The inner liner is aluminum, which handles the heat and condensation produced by gas combustion efficiently. Beyond exact-length fitting, the adjustable section also allows for easy disassembly during service calls and routine maintenance. It is built to absorb the linear thermal expansion that occurs in longer vent pipe runs, reducing stress on joints and fittings over time. This is a critical feature in multi-story or long horizontal vent runs where thermal movement is more pronounced. The Selkirk 104084 is compatible with approved gas appliances including furnaces, water heaters, boilers, and space heaters. It is commonly used by HVAC installers, plumbers, and mechanical contractors working on gas venting projects in homes, apartment buildings, and light commercial facilities. Type B gas vent systems are required by code for many natural gas and propane appliances, making this a standard go-to component on the job.

• Adjustable length ranges from 6 inches to 16 inches for precise vent run fitting
• Absorbs linear thermal expansion in longer pipe runs, protecting joints and connections
• Outer shell is 28-gauge galvanized steel with an aluminum inner liner for heat and moisture resistance

Product Highlights

The Selkirk 104084 RV Adjustable Length section gives installers a reliable, code-compliant solution for achieving exact vent lengths on Type B gas vent systems. Its thermal expansion absorption and easy disassembly make it a practical choice for both new installations and service work.

Product Information

Standard Information

• Brand: SELKIRK
• Manufacturer Part Number: 104084

Technical Specifications

• Inside Diameter: 4 inches
• Nominal Length: 18 inches
• Adjustment Range: 6 inches to 16 inches
• Vent Type: Type B Round Gas Vent
• Outer Material: 28-gauge galvanized steel
• Inner Liner Material: Aluminum
• Application: Residential and light commercial gas appliance venting
• Outside Diameter: Approximately 4.5 inches