Southwark Metal 58_5X4 Pipe Reducer 5x4 Inch Galvanized

Product Description

The SOUTHWARK METAL 58_5X4 is a 3-piece sheet metal pipe reducer designed to transition between a 5-inch diameter duct and a 4-inch diameter duct in forced-air HVAC systems. Fabricated from hot dip galvanized steel, it provides corrosion resistance suitable for both supply and return air applications. The no-crimp design accommodates field installation without requiring a pre-crimped fitting on the connecting pipe. HVAC sheet metal mechanics and duct installers use this reducer to maintain airflow continuity across diameter changes in residential and light commercial ductwork runs.

This reducer is suited for residential and light commercial forced-air duct systems where a 5-inch-to-4-inch transition is required. Common install scenarios include branch takeoffs, trunk-to-branch transitions, and air handler connections where duct sizing steps down along the supply or return run. The fitting meets ACCA and SMACNA standards, making it appropriate for duct systems designed and installed to those specifications.

Key Features

• Transitions from 5-inch diameter to 4-inch diameter duct
• Hot dip galvanized steel construction for corrosion resistance
• 3-piece design for straightforward field assembly
• No crimp supplied — connects to standard uncrimped pipe ends
• Meets ACCA and SMACNA applicable standards

Compatibility

Designed as an OEM-style sheet metal fitting for use in residential and light commercial forced-air duct systems built to ACCA and SMACNA standards with 5-inch and 4-inch round duct.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed sheet metal mechanic. Power down the air handling unit at the disconnect before working on the duct system. Secure all joints with sheet metal screws and seal with mastic or UL 181-listed tape per SMACNA and local mechanical code requirements. Verify duct sizing and airflow calculations conform to ACCA Manual D before finalizing the transition location.

Technical Specifications

• Larger End Size: 5 inches diameter
• Smaller End Size: 4 inches diameter
• Material: Hot Dip Galvanized Steel
• Type: 3-Piece
• Crimp Supplied: No
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 58_5X4