Southwark Metal 91_9X12 Sheet Metal Duct Box 9x12 Floor

Product Description

The SOUTHWARK METAL 91_9X12 is a sheet metal duct box designed for floor register applications in residential and light commercial HVAC installations. Built from hot dip galvanized steel, this duct box measures 9 inches by 12 inches with an 11-inch depth, providing the structural clearance needed to transition from the subfloor framing to a floor-mounted supply register. The galvanized construction resists corrosion in the moisture-prone environment beneath floor assemblies. HVAC installers and sheet metal fabricators use this type of duct box to terminate supply air runs at floor level, creating a clean, square opening for a standard floor grille or register to seat against.

This duct box is suited for forced-air heating and cooling systems where supply registers are located in the floor. Typical installations involve cutting a matching opening in the subfloor, dropping the duct box through, and connecting the open end to the supply duct branch below. The 9-by-12-inch face dimension accommodates a standard floor register of the same nominal size. Meets ACCA and SMACNA standards for sheet metal duct construction, making it appropriate for both new construction and replacement work in residential and light commercial settings.

Key Features

• Hot dip galvanized steel construction resists corrosion in subfloor environments
• 9 inches by 12 inches face size matches standard nominal floor register dimensions
• 11-inch depth provides clearance for connection to supply duct branch below the floor
• Meets ACCA and SMACNA applicable standards for sheet metal duct fabrication
• Designed specifically for floor register termination in forced-air systems

Compatibility

Designed as an OEM-style replacement and new-construction duct box for floor register applications accepting a standard 9-inch by 12-inch nominal floor grille or register.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Shut down the air handling system and, where applicable, the furnace or air handler before modifying any duct connections. The duct box should be secured to the subfloor framing per SMACNA installation guidelines, and all joints should be sealed with approved duct sealant or tape to prevent air leakage. Do not apply load-bearing weight directly to the duct box face after installation.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Face Size (A): 9 inches x 12 inches
• Face Size (B): 9 inches x 12 inches
• Depth: 11 inches
• Type: Floor Register Duct Box
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 91_9X12