Southwark Metal 58_6X4 Sheet Metal Pipe Reducer 6x4

Product Description

The SOUTHWARK METAL 58_6X4 is a 3-piece sheet metal pipe reducer designed to transition round duct from a 6-inch diameter to a 4-inch diameter in forced-air HVAC systems. Constructed from hot dip galvanized steel, it resists corrosion in both supply and return air applications. The fitting ships without a crimp, giving installers the flexibility to crimp on-site to match the specific duct connection required. This reducer is a standard component used by HVAC technicians in residential and light commercial ductwork installations where airflow must be stepped down between trunk lines and branch runs.

This fitting is suited for round duct systems in residential forced-air heating and cooling applications and light commercial HVAC installations. It is typically installed where a main duct trunk transitions to a smaller branch supply run. The 3-piece construction allows the fitting to maintain proper geometry through the transition, supporting balanced airflow distribution. HVAC installers working to ACCA and SMACNA standards will find this reducer consistent with those guidelines for round duct fabrication and installation practice.

Key Features

• Transitions round duct from 6 inches to 4 inches in a single fitting
• Hot dip galvanized steel construction for corrosion resistance in duct environments
• 3-piece design maintains geometric integrity through the diameter transition
• No crimp supplied — field crimp to match existing duct connections on-site
• Meets ACCA and SMACNA applicable standards for round duct fittings

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard round sheet metal duct systems using 6-inch and 4-inch diameter duct pipe.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with SMACNA round duct standards. Power down the air handler and lock out the system before working on connected ductwork. Crimp the appropriate end on-site using sheet metal crimping tools before connecting to adjoining duct sections, and seal all joints with UL 181-rated duct sealant or foil tape per local mechanical code requirements.

Technical Specifications

• Larger End Size: 6 inches
• Smaller End Size: 4 inches
• Material: Hot Dip Galvanized Steel
• Type: 3-Piece
• Crimp Supplied: No
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 58_6X4