Southwark Metal 58_4X3 Sheet Metal Pipe Reducer 4x3 in

Product Description

The SOUTHWARK METAL 58_4X3 is a 3-piece sheet metal pipe reducer designed to transition round ductwork from a 4-inch diameter down to a 3-inch diameter. Fabricated from hot dip galvanized steel, this reducer delivers corrosion resistance suited to HVAC duct systems in both residential and light commercial applications. The no-crimp design means the installer supplies the crimp connection as needed during assembly. It meets ACCA and SMACNA standards, making it a code-compliant choice for duct fabrication and retrofit work.

This reducer is used in forced-air HVAC duct systems where a branch or trunk requires a diameter change from 4 inches to 3 inches. Typical install scenarios include supply trunk branch-offs, air handler connections, and inline duct reductions in tight spaces. Sheet metal workers and HVAC installers place this fitting during new construction and system modification work where maintaining airflow velocity and minimizing turbulence at the transition point is a priority.

Key Features

• Transitions round duct from 4-inch to 3-inch diameter in a single fitting
• Hot dip galvanized steel construction provides corrosion resistance for long-term duct service
• 3-piece construction allows field assembly and precise fitment
• No crimp supplied — installer applies crimp connection per job requirements
• Meets ACCA and SMACNA applicable standards for duct fabrication

Compatibility

Designed as an OEM-style replacement and standard fitting for round sheet metal duct systems requiring a 4-inch to 3-inch reducer transition.

Installation Notes

Installation is typically performed by a licensed sheet metal worker or HVAC technician. Power down the air handling equipment before making any duct modifications. Secure the fitting with sheet metal screws and seal all joints with UL 181-rated foil tape or mastic sealant in accordance with SMACNA duct construction standards. Do not overtighten fasteners, as galvanized sheet metal can deform at connection points.

Technical Specifications

• Larger End Size: 4 inches diameter
• Smaller End Size: 3 inches diameter
• Material: Hot Dip Galvanized Steel
• Type: 3-Piece
• Crimp Supplied: No
• Applicable Standard: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 58_4X3