Southwark Metal 59F485SD Register Boot 8x4x5 with Flange

Product Description

The SOUTHWARK METAL 59F485SD is an 8 x 4 x 5 inch register boot with an integrated flange, designed for use in residential and light commercial forced-air duct systems. This fitting transitions from round duct to a rectangular register opening, directing conditioned air through a floor, wall, or ceiling register. The flange face provides a clean, flush mount surface for standard register grilles. HVAC installers and sheet metal contractors use this boot during new construction and retrofit duct rough-ins.

This register boot is suited for residential forced-air heating and cooling applications where a transition from a 5 inch round collar to an 8 x 4 inch rectangular register opening is required. It is commonly installed at the terminal end of branch duct runs, connecting supply ductwork to floor, sidewall, or ceiling registers in single-family homes, light commercial spaces, and manufactured housing duct systems.

Key Features

• 8 x 4 x 5 inch dimensions provide a standard rectangular-to-round duct transition
• Integrated flange allows flush mounting against subfloor, drywall, or ceiling surface
• 203RF-style geometry designed for use with standard round branch duct collars
• Compatible with standard 8 x 4 inch register grilles and diffusers
• Sheet metal construction suitable for supply air applications

Compatibility

Designed as an OEM-style replacement and new-construction fitting for residential and light commercial forced-air duct systems requiring an 8 x 4 inch register opening with a 5 inch round collar inlet.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal contractors and should comply with local mechanical codes and SMACNA duct construction standards. Power down the air handling unit and close the system dampers before connecting or sealing duct fittings. Secure the boot with sheet metal screws and seal all joints with listed duct mastic or foil-backed tape per applicable codes. Avoid over-driving fasteners into the flange face, which can distort the seating surface and cause air leakage at the register grille.

Technical Specifications

• Register Opening Size: 8 x 4 inches
• Round Collar Size: 5 inches
• Boot Style: 203RF with Flange

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 59F485SD