Southwark Metal 21r8201612 Model 21 End Cap R8 Insulation

Product Description

The SOUTHWARK METAL 21r8201612 is a Model 21 rectangular duct end cap with R8 insulation, measuring 20 inches by 16.5 inches. Constructed from hot-dipped galvanized steel meeting ASTM A653 CS Type B at 26 gauge, this end cap provides a durable, corrosion-resistant closure for insulated rectangular ductwork. The S-Lock drive-type connection ensures a secure fit during installation. It is sold as a single unit and is intended for use by licensed HVAC technicians on commercial and residential forced-air duct systems requiring insulated end terminations.

This end cap is suited for insulated rectangular duct assemblies in both residential and light commercial HVAC applications. It is typically installed at duct termination points where a sealed, insulated closure is required to maintain system efficiency and meet energy code requirements. The R8 insulation level makes it appropriate for unconditioned spaces such as attics, crawlspaces, and mechanical rooms where higher thermal resistance is specified.

Key Features

• Hot-dipped galvanized steel construction per ASTM A653 CS Type B for corrosion resistance
• 26 gauge steel for structural rigidity in duct termination applications
• R8 insulation rating suitable for unconditioned space installations
• S-Lock drive-type connection for secure duct attachment
• Compatible with S-cleat fastening method
• Available in R4, R6, and R8 insulation options within the Model 21 product line

Compatibility

Designed as an OEM-style replacement and standard fit for Model 21 insulated rectangular duct systems using S-Lock drive and S-cleat connections.

Installation Notes

Installation should be performed by a qualified HVAC technician in accordance with SMACNA duct construction standards and applicable local mechanical codes. Disconnect and lock out power to the air handling system before beginning duct work. S-Lock drive connections should be fully engaged and sealed per project specifications. Sheet metal gloves and appropriate hand tools are recommended when handling 26 gauge galvanized steel components.

Technical Specifications

• Model: 21
• Type: End Cap
• Width: 20 inches
• Height: 16.5 inches
• Insulation Rating: R8
• Gauge: 26
• Material: Hot-Dipped Galvanized Steel
• Material Standard: ASTM A653 CS Type B
• Connection Type: S-Lock Drive
• Unit of Measure: Each

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 21r8201612