Southwark Metal 85r84128 Insulated Ceiling Box R8

Product Description

The SOUTHWARK METAL 85r84128 is an insulated ceiling box designed for use in residential and light commercial HVAC duct systems. It features a top outlet and a bottom flange configuration, making it a standard register box for ceiling diffuser applications. The box is constructed from hot-dipped galvanized steel per ASTM A653 CS Type B, offering corrosion resistance suited to mechanical spaces and attic installations. It ships with R8 insulation, which corresponds to 2 inches of insulation thickness, and incorporates a 3-inch-long collar with a bead for secure duct connection. Box gauge is 30 gauge (0.012 inches) and the collar is 28 gauge (0.015 inches).

This ceiling box is intended for installation in residential and light commercial forced-air HVAC systems where a ceiling-mounted supply register is required. The top outlet connects to a flexible or rigid duct run from the supply plenum, while the bottom flange seats flush against drywall for a clean register mount. The 2-inch flange and 0.5-inch drywall flange provide secure attachment to ceiling framing or drywall surfaces. It is sized at 4 inches by 12 inches by 8 inches, making it appropriate for standard residential register openings in that configuration. HVAC installers and sheet metal contractors are the primary trades that handle this component during new construction or retrofit work.

Key Features

• Hot-dipped galvanized steel construction per ASTM A653 CS Type B for corrosion resistance
• R8 insulation (2 inches thick) factory-applied to reduce heat gain and condensation on the box exterior
• 3-inch-long collar with bead for secure flexible or rigid duct connection
• Top outlet and bottom flange layout for standard ceiling supply register installations
• 30-gauge box body (0.012 inches) and 28-gauge collar (0.015 inches) for structural rigidity
• 2-inch flange and 0.5-inch drywall flange for clean ceiling surface attachment

Compatibility

Designed as an OEM-style ceiling register box for residential and light commercial forced-air supply duct systems requiring a 4-inch by 12-inch by 8-inch ceiling box with R8 insulation. The Model 85 series is also available in R4 and R6 insulation variants for installations with different energy code requirements.

Installation Notes

Installation is typically performed by licensed HVAC contractors or sheet metal mechanics. Disconnect and lock out the air handler or furnace before beginning work. Secure the collar connection to the supply duct using approved mechanical fasteners and mastic or listed foil tape in accordance with applicable mechanical codes. Ensure the bottom flange is properly supported by ceiling framing to carry the weight of the box and attached ductwork.

Technical Specifications

• Dimensions: 4 inches x 12 inches x 8 inches
• Insulation Rating: R8
• Insulation Thickness: 2 inches
• Configuration: Top outlet, bottom flange
• Material: Hot-dipped galvanized steel
• Material Standard: ASTM A653 CS Type B
• Box Gauge: 30 gauge (0.012 inches)
• Collar Gauge: 28 gauge (0.015 inches)
• Collar Length: 3 inches
• Flange Width: 2 inches
• Drywall Flange: 0.5 inches
• Unit of Measure: Each

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 85r84128