Southwark Metal 21R82026 Model 21 End Cap R8 Insulation 20 Inches X 26 Inches

Product Description

The Southwark Metal 21R82026 is a Model 21 rectangular end cap designed for use with insulated rectangular ductwork. It is built for HVAC installations that require a clean, sealed termination point on a duct run. This end cap fits a duct size of 20 inches x 26 inches and includes R8 insulation, making it well suited for energy-efficient heating and cooling systems. It is sold individually as a single unit. HVAC technicians and sheet metal contractors rely on end caps like this one to close off the open end of a duct section, preventing air leakage and maintaining system pressure. A properly installed end cap also keeps debris, pests, and moisture out of the duct interior. The 21R82026 is fabricated from hot dipped galvanized steel meeting ASTM A653 CS Type B standards, which provides strong corrosion resistance for long service life in both conditioned and unconditioned spaces. The 26-gauge steel construction offers a good balance of rigidity and workability on the job. The S-Lock drive connection type makes field installation straightforward and compatible with standard rectangular duct systems. An S-cleat option is also available for added securing flexibility. Southwark Metal manufactures this product in the USA, and it carries a Prop 65 designation. The R8 insulation rating helps reduce thermal loss and condensation on the duct surface, supporting better overall system efficiency. This end cap is a practical, code-compatible component for new construction HVAC duct systems, commercial tenant improvements, and retrofit projects where a rectangular duct run must be properly capped and insulated.

• Model 21 rectangular end cap fits 20 inches x 26 inches duct openings with R8 insulation included
• Fabricated from hot dipped galvanized steel per ASTM A653 CS Type B in 26 gauge for durability and corrosion resistance
• S-Lock drive type connection for easy field installation; S-cleat option available

Product Highlights

The Southwark Metal 21R82026 delivers a durable, insulated end cap solution for rectangular duct systems, combining galvanized steel construction with R8 insulation and a standard S-Lock drive for reliable, efficient installation.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21R82026

Technical Specifications

• Shape: Rectangle
• Material: Galvanized Steel
• Gauge: 26 GA
• Duct Size: 20 inches x 26 inches
• Insulation Rating: R8
• Connection Type: S-Lock Drive
• Galvanized Coating: Yes
• Length: 20 inches
• Width: 26.5 inches
• Height: 3 inches
• Weight: 2.75 pounds
• Country of Origin: USA
• Unit of Measure: Each
• Prop 65: Yes