Southwark Metal 91_4X10 Sheet Metal Duct Box 4x10 Floor

Product Description

The SOUTHWARK METAL 91_4X10 is a sheet metal duct box designed for floor register installations in residential and light commercial forced-air HVAC systems. Fabricated from hot-dip galvanized steel, this duct box measures 4 inches by 10 inches with an 11-inch depth, providing the structural support and airflow pathway needed beneath a floor register grille. The galvanized steel construction resists corrosion in the subfloor environment where moisture and temperature swings are common. HVAC installers and sheet metal contractors use this type of duct box to terminate supply runs at floor-level register openings, creating a clean, secure transition between the duct run and the finished floor surface.

This duct box is suited for floor register applications in new construction and retrofit projects. The 4-inch by 10-inch opening matches standard floor register grille sizes, making it a straightforward fit in typical residential supply layouts. The 11-inch depth accommodates installation in standard floor joist cavities and allows adequate clearance for connecting to round or rectangular branch duct runs from below. Sheet metal contractors and HVAC technicians working on forced-air systems will find this a direct-fit component for floor-level supply terminations.

Key Features

• Hot-dip galvanized steel construction resists corrosion in subfloor and crawlspace environments
• 4 inches by 10 inches opening matches standard floor register grille sizes
• 11-inch depth fits typical floor joist cavity installations
• Meets ACCA and SMACNA applicable standards for sheet metal duct fabrication
• Floor register type design provides a secure grille seating surface

Compatibility

Designed as an OEM-style replacement and new-construction component for floor register duct terminations in residential and light commercial forced-air HVAC supply systems accepting a 4-inch by 10-inch register opening.

Installation Notes

Installation is typically performed by a licensed sheet metal contractor or HVAC technician. Shut down the air handling system before cutting into existing duct runs or securing the box in the floor cavity. Fasten the duct box securely to the subfloor framing and seal all joints with approved duct sealant or metal tape per SMACNA guidelines to prevent air leakage. Ensure the register grille face aligns flush with the finished floor surface before final fastening.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Opening Size: 4 inches x 10 inches
• Depth: 11 inches
• Type: Floor Register Duct Box
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 91_4X10