Southwark Metal 73C12128 Rectangular to Round Transition 12 Inches X 12 Inches X 8 Inches

Product Description

The Southwark Metal 73C12128 is a rectangular to round transition fitting designed for HVAC duct systems. It connects a rectangular duct opening to a round collar, allowing airflow to move from one duct shape to another without restriction. HVAC installers, sheet metal workers, and mechanical contractors use this type of fitting when transitioning from a main rectangular trunk line to a round branch duct or flexible duct run. This fitting measures 12 inches by 12 inches on the rectangular end and connects to an 8 inch round collar. The collar height is approximately 2 inches for diameters up to 16 inches. This makes it a practical solution for residential and light commercial HVAC installations where duct layout requires a shape change. The 73C12128 is manufactured from hot dipped galvanized steel meeting ASTM A653 CS Type B standards. It is formed from 28 gauge galvanized steel, which provides good rigidity while remaining light enough for easy single-person installation. The galvanized coating resists rust and corrosion, extending the service life of the fitting in both conditioned and unconditioned spaces such as attics, crawlspaces, and mechanical rooms. The rectangular duct size is 12 inches by 12 inches, making it compatible with standard 12 inch square trunk duct systems. The round outlet is 8 inches in diameter, which fits standard 8 inch round duct pipe and flexible duct connectors. This fitting ships as a single unit and is made in the USA. Southwark Metal is a well-known manufacturer of sheet metal HVAC fittings and duct components trusted by trade professionals across the industry. The 73C fitting family covers a wide range of rectangular to round transition sizes, from 6 by 6 through 20 by 20, giving contractors flexibility across many job types.

• Transitions a 12 inches by 12 inches rectangular duct to an 8 inch round collar for versatile duct layout options
• Constructed from 28 gauge hot dipped galvanized steel per ASTM A653 CS Type B for durability and corrosion resistance
• Made in the USA by Southwark Metal, a trusted name in sheet metal HVAC duct fittings

Product Highlights

The Southwark Metal 73C12128 rectangular to round transition delivers reliable performance in standard HVAC duct systems. Its galvanized steel construction and precise sizing make it a dependable choice for professional installers working on residential and light commercial projects.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 73C12128

Technical Specifications

• Material: Galvanized Steel
• Gauge: 28 GA
• Rectangular Duct Size: 12 inches x 12 inches
• Round Collar Diameter: 8 inches
• Collar Height: Approximately 2 inches
• Galvanized Coating: Yes, hot dipped per ASTM A653 CS Type B
• Country of Origin: USA
• Weight: 2.332 pounds
• Unit of Measure: Each
• Prop 65: Yes