Selkirk 3M90 Type B Gas Vent 90 Degree Elbow 3 Inch

Product Description

The SELKIRK 3M90 is a 3-inch diameter, double-wall, adjustable 90-degree elbow designed for Type B gas vent systems. The inner wall is aluminum alloy at 0.012 inches thick, and the outer wall is G90 galvanized steel at 0.018 inches thick. This elbow directs vented combustion gases around corners and offsets within a B-vent run, maintaining the air-gap insulation that Type B pipe requires. It includes a lock tab non-positional lock system for secure, tool-assisted connections. Licensed HVAC technicians and gas appliance installers are the primary trades who work with this fitting.

The 3M90 is rated for residential, commercial, and industrial installations. Typical applications include venting gas-fired furnaces, water heaters, and stoves. The fitting integrates into Type B gas vent runs where a 90-degree directional change is required. Its double-wall construction maintains draft and limits heat transfer to adjacent framing and building materials, which is critical in tight utility chases and closet installations.

Key Features

• 90-degree adjustable elbow configuration for directional changes in Type B B-vent runs
• Double-wall construction: aluminum alloy inner wall and G90 galvanized steel outer wall
• Inner wall material thickness of 0.012 inches; outer wall material thickness of 0.018 inches
• Lock tab non-positional lock system allows secure connection at any rotational angle
• Listed to UL 441, ULC S605, and NFPA 54/211 standards
• Suitable for residential, commercial, and industrial gas appliance venting

Compatibility

Designed for use with Type B gas vent pipe systems, including applications on gas-fired furnaces, water heaters, stoves, and other fired appliances in residential, commercial, and industrial settings. Compatible within the SELKIRK RV series double-wall vent pipe system at 3-inch diameter.

Installation Notes

Installation of Type B gas vent fittings must be performed by a licensed HVAC technician or gas appliance installer in accordance with NFPA 54, NFPA 211, and applicable local codes. Shut off the gas supply and allow the appliance to cool completely before disconnecting or modifying any vent section. Maintain required clearances to combustibles as specified by the fitting manufacturer and the governing installation standard. Do not mix Type B vent components from different manufacturers within the same vent system unless explicitly listed for such use.