Southwark Metal 21R82616 End Cap R8 Insulation 26 Inches X 16 Inches

Product Description

The Southwark Metal 21R82616 is a Model 21 rectangular duct end cap with R8 insulation, sized at 26 inches by 16 inches. This end cap is designed to seal the open end of a rectangular duct run, preventing conditioned air from escaping and maintaining system efficiency. It is built for use in residential and light commercial HVAC installations where insulated ductwork is required to meet energy codes or performance standards. The 21R82616 is fabricated from hot dipped galvanized steel that meets ASTM A653 CS Type B standards, giving it strong resistance to corrosion and ensuring a long service life in both conditioned and unconditioned spaces such as attics, crawlspaces, and mechanical rooms. At 26 gauge, the steel offers a reliable balance of rigidity and workability, making it easier for sheet metal workers and HVAC technicians to handle and install on the job. The end cap uses an S-Lock and Drive connection type, which is one of the most common joining methods in rectangular duct systems. This design allows the cap to connect securely to standard duct sections without the need for special tools or hardware. An S-cleat is also available as an option for added joint security. The R8 insulation rating means this end cap provides a high level of thermal resistance, which is especially important in unconditioned spaces where heat gain or heat loss can significantly reduce system efficiency. Choosing the correct insulation level for your duct terminations is a key step in any quality HVAC installation. HVAC installers, duct fabricators, and mechanical contractors will find this end cap suitable for use in new construction and retrofit applications. It ships as a single unit and is proudly manufactured in the USA.

• Rectangular duct end cap sized at 26 inches by 16 inches with R8 insulation for high thermal performance
• Fabricated from 26 gauge hot dipped galvanized steel per ASTM A653 CS Type B for corrosion resistance and durability
• S-Lock and Drive connection type for fast, secure installation with standard rectangular duct systems

Product Highlights

The Southwark Metal 21R82616 delivers a code-compliant, thermally efficient seal for rectangular duct ends using durable galvanized steel construction and a standard S-Lock and Drive connection. Its R8 insulation rating makes it well suited for installations in unconditioned spaces where energy efficiency is a priority.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21R82616

Technical Specifications

• Shape: Rectangle
• Duct Size: 26 inches x 16 inches
• Gauge: 26 GA
• Material: Galvanized Steel
• Galvanized Coating: Yes
• Insulation Rating: R8
• Connection Type: S-Lock and Drive
• Steel Standard: ASTM A653 CS Type B
• Weight: 2.25 pounds
• Height: 3 inches
• Width: 16.5 inches
• Length: 26 inches
• Country of Origin: USA
• Unit of Measure: Each
• Prop 65: Yes