Southwark Metal USBR817342820 Unit Support Box R-8 Insulation 17 3/4 Inches X 28 Inches X 20 Inches

Product Description

The Southwark Metal USBR817342820 is a galvanized steel unit support box with R-8 insulation, sized at 17 3/4 inches x 28 inches x 20 inches. It is built for HVAC installations where a rigid, insulated support platform is needed beneath air handling units, fan coil units, or similar equipment in residential and light commercial applications. The box provides a stable base that keeps equipment elevated and thermally isolated from surrounding surfaces, reducing energy loss and condensation issues that are common in unconditioned spaces like attics and mechanical rooms. Fabricated from 26-gauge hot-dipped galvanized steel meeting ASTM A653 CS Type B standards, this unit support box delivers lasting corrosion resistance in humid and high-temperature environments. The galvanized coating protects against rust, making it suitable for long-term installations where maintenance access is limited. All four sides are beaded for added structural strength, so the box holds its shape under equipment load without warping or flexing. A 1-inch turned-in flange runs along all sides, and a 1-inch flange is turned up on three sides, with the customer specifying the opening orientation on either the A-width or B-length side to suit the duct or equipment entry point. R-8 insulation is factory-installed using adhesive, providing excellent thermal performance and meeting common energy code requirements for HVAC support structures. This unit is manufactured in the USA and carries a Prop 65 designation. HVAC installers and sheet metal contractors rely on Southwark USB-series support boxes for consistent fit, code-compliant insulation values, and durable galvanized construction across a wide range of unit sizes.

• 26-gauge hot-dipped galvanized steel construction per ASTM A653 CS Type B for corrosion resistance and long service life
• R-8 insulation factory-installed with adhesive on all sides for thermal efficiency and energy code compliance
• All sides beaded for structural rigidity with 1-inch flanges on all sides for secure installation and duct connection

Product Highlights

The Southwark Metal USBR817342820 unit support box combines durable galvanized steel construction with factory-installed R-8 insulation, giving HVAC professionals a ready-to-install support platform that meets thermal performance requirements in a 17 3/4 inches x 28 inches x 20 inches form factor.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: USBR817342820

Technical Specifications

• Size: 17 3/4 inches x 28 inches x 20 inches
• Gauge: 26 GA
• Material: Galvanized Steel
• Insulation: R-8
• Insulated: Yes
• Galvanized: Yes
• Adjustable: No
• Weight: 13.018 pounds
• Product Family: USB
• Country of Origin: USA
• Unit of Measure: Each