Southwark Metal 4R820142048 Custom Plenum R8 Insulated Model 4 20 1/4 Inches X 20 Inches X 48 Inches

Product Description

The Southwark Metal 4R820142048 is a Model 4 Custom Plenum built for commercial and residential HVAC duct systems that demand reliable thermal performance and structural durability. This plenum measures 20 1/4 inches in length, 20 inches in width, and 48 inches in height, making it well suited for larger air distribution applications where space and airflow capacity matter. It features R8 insulation, which significantly reduces heat transfer through the plenum walls and helps maintain conditioned air temperatures from the air handler to the connected duct runs. This level of insulation meets common energy code requirements in many jurisdictions, making it a practical choice for new construction and retrofit HVAC installations alike. The insulation is secured to the sheet metal shell using a combination of glue and pins, ensuring it stays bonded during handling, shipping, and long-term operation. The body is fabricated from 26-gauge hot-dipped galvanized steel conforming to ASTM A653 CS Type B standards. This galvanized construction resists corrosion in both conditioned and unconditioned spaces, extending the service life of the unit. The plenum ships knocked down in three pieces, allowing for easier transport and maneuverability into tight mechanical rooms or through access points where a fully assembled unit would not fit. Once on site, HVAC technicians can assemble the sections quickly before installation. The sides are beaded left to right, with approximately 8 to 10 inches of space between beads, which varies depending on the plenum size. These beads add rigidity to the sheet metal panels, reducing oil-canning and maintaining a flat, stable wall surface. Insulation thicknesses of 1/2 inch, 1 inch, 1 1/2 inches, and 2 inches are available by special request for projects requiring different thermal specifications. This plenum is manufactured in the USA and is subject to California Proposition 65 requirements.

• R8 insulation bonded with glue and pins for durable, long-lasting thermal performance
• 26-gauge hot-dipped galvanized steel per ASTM A653 CS Type B for corrosion resistance and structural integrity
• Ships knocked down in 3 pieces for easier handling and installation in tight mechanical spaces

Product Highlights

The Southwark Metal 4R820142048 Custom Plenum delivers high R-value insulation and heavy-gauge galvanized steel construction in a field-assemblable format, making it a dependable choice for HVAC contractors and sheet metal professionals working on commercial and residential air distribution systems.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 4R820142048

Technical Specifications

• Model: Model 4 Custom Plenum
• Size: 20 1/4 inches x 20 inches x 48 inches
• Length: 20.5 inches
• Width: 20 inches
• Height: 48 inches
• Weight: 35 pounds
• Dimensional Weight: 146 pounds
• Gauge: 26 GA
• Material: Galvanized Steel
• Galvanized: Yes
• Insulated: Yes
• R-Value: R8
• Flanged: No
• Material Standard: ASTM A653 CS Type B Hot Dipped Galvanized Steel
• Ships Knocked Down: Yes, 3 pieces
• Country of Origin: USA
• Prop 65: Yes
• Unit of Measure: EA