Southwark Metal 58_18X16 Sheet Metal Pipe Reducer 18x16

Product Description

The SOUTHWARK METAL 58_18X16 is a 3-piece sheet metal pipe reducer designed to transition between an 18-inch diameter duct and a 16-inch diameter duct in forced-air HVAC systems. Fabricated from hot dip galvanized steel, this reducer delivers corrosion resistance suited to both supply and return air applications. The no-crimp design means the fitting ships without a pre-formed male end, giving installers flexibility when mating to existing ductwork. HVAC sheet metal mechanics and duct fabricators are the primary trade installing this fitting.

This reducer is used in residential and light commercial ducted HVAC systems where a main trunk or branch run must step down from an 18-inch round duct to a 16-inch round duct. It is built to ACCA and SMACNA standards, making it appropriate for system designs and installations that follow those industry guidelines. Typical install scenarios include air handler connections, trunk transitions, and branch take-off reductions in new construction or retrofit duct systems.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in HVAC duct environments
• 3-piece fabrication for consistent roundness and dimensional accuracy
• No-crimp end allows installer to form the male bead on-site to match existing fittings
• Compliant with ACCA and SMACNA applicable standards
• Transitions from 18-inch larger end to 16-inch smaller end in a single fitting

Compatibility

Designed as an OEM-style replacement and new-construction fitting for round sheet metal duct systems requiring an 18-inch to 16-inch round reducer transition built to ACCA and SMACNA standards.

Installation Notes

Installation is performed by licensed HVAC mechanics or qualified sheet metal workers. Power down the air handler or furnace and verify the system is de-energized before cutting into or modifying any duct section. Secure the fitting with sheet metal screws and seal all joints with listed duct sealant or UL 181-rated tape per applicable mechanical code requirements. Because no crimp is supplied, form the male bead with an appropriate hand or power beader tool before assembly.

Technical Specifications

• Larger End Size: 18 inches diameter
• Smaller End Size: 16 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_18X16