Selkirk 1740022 Double Wall Flex Connector 4 in Type B

Product Description

The SELKIRK 1740022 is a double wall flexible gas vent connector designed for use in Type B gas vent systems. This 4-inch diameter, 2-foot flexible connector bridges the gap between rigid vent sections, allowing technicians to create quick offsets and simplify alignment during installation. The inner liner and outer wall construction are built from steel and aluminum, providing the thermal performance required for listed Type B applications. HVAC technicians and gas appliance installers use this connector where rigid pipe alignment is difficult or where minor angular corrections are needed between vent segments.

This connector is listed for use as a segment within an unenclosed Type B gas vent system. It is safety certified for installation in conditioned and unconditioned attics and crawl spaces, making it suitable for a wide range of residential gas appliance venting scenarios. The DWC series is available in 3-inch, 4-inch, and 5-inch diameters, and in 2-foot, 3-foot, 4-foot, and 5-foot lengths, giving installers flexibility to match existing vent system configurations.

Key Features

• 4-inch inside diameter fits standard Type B gas vent components
• 2-foot flexible length enables offset alignment between rigid vent sections
• Double wall construction with steel and aluminum composition
• UL Listed for use as a segment of an unenclosed Type B gas vent system
• Certified for use in conditioned and unconditioned attics and crawl spaces
• Flexible design reduces the need for additional elbows or fittings during alignment

Compatibility

Designed for connection to standard Type B gas vent pipe and fittings. Listed for use as a segment of an unenclosed Type B gas vent system in residential installations.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified gas appliance installer in accordance with the appliance manufacturer instructions and applicable local codes, including NFPA 54 and the International Fuel Gas Code (IFGC). Shut off the gas supply and allow the appliance to cool completely before disconnecting or modifying any vent sections. Do not use this connector as the sole vent path or in enclosed chases where Type B unenclosed listings do not apply. Verify that all joints are fully seated and secured before returning the system to service.

Technical Specifications

• Inside Diameter: 4 inches
• Length: 2 feet
• Height: 24.7 inches
• Width: 10.4 inches
• Overall Package Length: 14.9 inches
• Weight: 1.825 pounds
• Material Composition: Steel and Aluminum
• Approvals: UL Listed
• Country of Origin: Varies

Standard Information

• Brand: SELKIRK
• Manufacturer Part Number: 1740022