Southwark Metal SP58-26GA_14X12 Spiral Pipe Reducer 26GA

Product Description

The SOUTHWARK METAL SP58-26GA_14X12 is a tapered sheet metal spiral pipe reducer used to transition between two different round duct diameters in forced-air HVAC systems. Fabricated from hot dip galvanized steel at 26 gauge, it steps down from a 14-inch diameter inlet to a 12-inch diameter outlet. The tapered design maintains airflow continuity through the transition, reducing turbulence at the connection point. This fitting is installed by sheet metal mechanics and HVAC technicians during trunk-and-branch or main-line duct system construction or retrofit work.

This reducer is suited for residential and light commercial ductwork applications where a round spiral duct system requires a concentric size reduction. It is commonly installed at fan discharge transitions, trunk-line reductions, or branch takeoff points where duct sizing changes to balance static pressure and airflow volume. The fitting meets ACCA and SMACNA standards, making it appropriate for systems designed and installed in accordance with SMACNA duct construction specifications.

Key Features

• Tapered concentric design transitions 14-inch duct to 12-inch duct in a single fitting
• Hot dip galvanized steel construction resists corrosion in conditioned and unconditioned spaces
• 26 gauge material thickness meets SMACNA standards for low- and medium-pressure round duct systems
• Compatible with spiral lockseam duct systems for a secure, consistent connection
• Meets ACCA and SMACNA applicable standards for duct fabrication and installation

Compatibility

Designed as an OEM-style replacement or new-installation fitting for round spiral duct systems with a 14-inch main and a 12-inch branch or continuation run, conforming to ACCA and SMACNA duct construction standards.

Installation Notes

Installation is performed by licensed HVAC technicians or journeyman sheet metal mechanics. Shut down the air handling unit and verify the system is depressurized before modifying any duct section. Secure the fitting using sheet metal screws and seal all joints with UL 181-listed duct sealant or foil tape per SMACNA installation guidelines. Do not use this fitting on systems operating outside the pressure class for which 26 gauge round duct is rated.

Technical Specifications

• Larger End Diameter: 14 inches
• Smaller End Diameter: 12 inches
• Material: Hot Dip Galvanized Steel
• Material Thickness: 26 Gauge
• Type: Tapered
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: SP58-26GA_14X12