Southwark Metal 73C161616 Duct Transition Square to Round 16 Inches X 16 Inches Galvanized Steel 28 Gauge

Product Description

The Southwark Metal 73C161616 is a square-to-round duct transition designed for HVAC duct systems that require a change from rectangular to round ductwork. This transition fitting connects a 16-inch by 16-inch square or rectangular duct opening to a 16-inch round collar, making it a practical solution for air handling systems where duct shape changes are needed between equipment, plenums, and branch runs. HVAC installers, sheet metal contractors, and mechanical tradespeople rely on fittings like this to maintain consistent airflow and minimize turbulence when transitioning between different duct geometries. The 73C161616 is fabricated from hot-dipped galvanized steel meeting ASTM A653 CS Type B standards, which means the steel is coated for corrosion resistance and long-term durability in both residential and light commercial HVAC applications. The 28-gauge construction gives the fitting enough rigidity for standard ductwork installations while remaining manageable during handling and field installation. The round collar on this transition measures 16 inches in diameter with a collar height of approximately 3 inches, which is standard for fittings of this diameter size. The square end measures 16 inches by 16 inches, and the overall fitting height is 12 inches, giving the transition a gradual taper that supports smooth airflow from the rectangular plenum side to the round duct side. This fitting is sold individually and is manufactured in the USA. It carries a Prop 65 designation and ships at approximately 3.15 pounds. The galvanized coating provides protection against moisture and oxidation, which is important in attic, crawlspace, and basement duct installations where condensation is a concern. HVAC technicians can use this fitting with standard round spiral duct, flex duct, or boot connections on the round collar end.

• Square-to-round transition connecting 16 inches by 16 inches rectangular duct to 16 inches round collar
• Fabricated from hot-dipped galvanized steel per ASTM A653 CS Type B in 28 gauge for corrosion resistance and rigidity
• Round collar height of approximately 3 inches with an overall fitting height of 12 inches for a smooth airflow taper

Product Highlights

The Southwark Metal 73C161616 delivers a reliable square-to-round duct transition in durable 28-gauge galvanized steel, purpose-built for HVAC installations requiring a clean connection between rectangular and round ductwork sections.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 73C161616

Technical Specifications

• Material: Galvanized Steel
• Steel Standard: Hot Dipped Galvanized per ASTM A653 CS Type B
• Gauge: 28 GA
• Square End Size: 16 inches x 16 inches
• Round Collar Diameter: 16 inches
• Collar Height: Approximately 3 inches
• Overall Height: 12 inches
• Length: 16 inches
• Width: 16 inches
• Weight: 3.15 pounds
• Duct Size Range: 12 inches x 20 inches to 16 inches Round
• Unit of Measure: Each
• Country of Origin: USA
• UPC: 099274614310
• Prop 65: Yes