Southwark Metal CBR8181822 Cube Closed Plenum R8 18 Inches X 18 Inches X 22 Inches with 2 Inches Liner

Product Description

The Southwark Metal CBR8181822 is a cube closed plenum designed for use in residential and light commercial HVAC duct systems. It measures 18 inches wide by 18 inches long by 22 inches tall and features a 2-inch insulation liner rated at R8. This plenum serves as a central air distribution box that connects an air handler or furnace to the supply duct network. It directs conditioned air from the unit into the branch ducts that feed each room or zone in a building. HVAC installers and sheet metal contractors rely on closed plenums like this one to create tight, efficient duct connections that minimize air leakage and heat loss. The CBR8181822 is constructed from 26-gauge galvanized steel, which provides long-lasting corrosion resistance in attic, basement, and crawl space environments. The galvanized coating protects the metal from moisture and rust over years of service. The internal 2-inch liner delivers an R8 insulation value, helping the system maintain air temperature as conditioned air travels from the unit to the supply ducts. This reduces energy loss and improves overall system efficiency. The plenum ships as a single unit and is manufactured in the USA, making it a dependable choice for contractors who need consistent quality and reliable lead times. At 15 pounds, it is manageable for a single installer to handle and position during rough-in work. The non-flanged design allows for flexible field connections using standard sheet metal screws and mastic or foil tape. This unit is well suited for new construction installs and equipment changeouts where a properly sized, insulated plenum is required to meet energy code requirements.

• R8 insulation rating with 2-inch internal liner reduces heat loss and improves system efficiency
• 26-gauge galvanized steel construction provides corrosion resistance for long-term durability
• Made in the USA for consistent quality and reliable availability for HVAC contractors

Product Highlights

The Southwark Metal CBR8181822 is a 26-gauge galvanized steel cube closed plenum with R8 insulation, built for dependable air distribution in residential and light commercial HVAC systems. Its 18 inches by 18 inches by 22 inches profile and 2-inch liner make it a direct fit for common equipment footprints and energy code applications.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: CBR8181822

Technical Specifications

• Size: 18 inches x 18 inches x 22 inches
• Width: 18 inches
• Length: 18 inches
• Height: 22 inches
• Liner Thickness: 2 inches
• R-Value: R8
• Gauge: 26 GA
• Composition: Galvanized Steel
• Galvanized: Yes
• Insulated: Yes
• Flanged: No
• Weight: 15 pounds
• Cubic Measurement: 4.125
• Country of Origin: USA
• Unit of Measure: Each