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The 3-in-90deg-alum-elbow is a four-piece, all-aluminum 90-degree vent elbow designed for venting residential and light commercial heating units. Constructed from 30-gauge aluminum, the elbow is fully adjustable to 90 degrees, allowing the installer to dial in the angle before securing the connection. At 0.128 pounds, it is lightweight and easy to handle during installation. The crimped end on one side simplifies joining to adjacent vent sections without additional forming. This fitting is a standard component in low-pressure exhaust vent runs for gas and oil-fired heating equipment.
This elbow is used in exhaust vent systems for furnaces, boilers, water heaters, and similar heating appliances that discharge through B-vent or single-wall metal vent pipe. With a 3-inch diameter and a nominal 6-inch width, it fits standard vent pipe runs where a 90-degree direction change is required. The adjustable four-piece design accommodates offsets in tight mechanical rooms or utility spaces where a fixed elbow would not seat cleanly. It is sold in a pack of 12, making it practical for contractors stocking materials for multiple jobs.
Designed as a standard-diameter replacement or new-installation fitting for 3-inch single-wall metal vent pipe systems used with most residential and light commercial heating units.
A licensed HVAC technician or plumber should install vent elbows in accordance with the appliance manufacturer instructions and applicable mechanical codes such as the IFGC. Shut down and allow the appliance to cool completely before disconnecting or modifying any vent section. Ensure all joints are secured with at least three sheet-metal screws per connection as required by most code authorities. Do not use this fitting in positive-pressure or direct-vent sealed combustion systems unless confirmed compatible by the appliance manufacturer.
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