Southwark Metal SP58_18X14 Spiral Duct Reducer 18x14 24GA

Product Description

The SOUTHWARK METAL SP58_18X14 is a tapped spiral round sheet metal duct reducer used to transition between two different round duct diameters in forced-air HVAC systems. Fabricated from hot-dipped galvanized steel at 24 gauge, it transitions from an 18-inch diameter larger end down to a 14-inch diameter smaller end. The tapped spiral construction provides a secure, low-leak connection point at each end. This fitting is installed by licensed HVAC technicians and sheet metal contractors during new construction ductwork layout or system modification projects where airflow must be redirected through a smaller diameter run.

This reducer is suited for residential and light commercial ducted HVAC applications where round spiral duct is the primary distribution method. It is used in supply trunk-to-branch transitions, air handler connections, and inline duct diameter changes. Fabricated to ACCA and SMACNA standards, this fitting meets the industry benchmarks for round spiral ductwork systems. The galvanized finish resists corrosion in both conditioned and unconditioned spaces such as attics, crawlspaces, and mechanical rooms.

Key Features

• Transitions from 18-inch diameter to 14-inch diameter round spiral duct
• 24 gauge hot-dipped galvanized steel construction for corrosion resistance
• Tapped spiral ends for secure mechanical connection to mating duct sections
• Meets ACCA and SMACNA applicable standards for round ductwork fabrication
• Round profile compatible with standard spiral duct fittings and connectors

Compatibility

Designed as an OEM-style replacement and new-installation fitting for round spiral duct systems using 18-inch and 14-inch diameter sections in residential and light commercial forced-air HVAC applications.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed sheet metal contractor in accordance with SMACNA ductwork installation standards. Shut down and lock out the air handling system before installing or modifying any duct section. Secure all joints with the appropriate fasteners and seal with UL 181-listed duct sealant or mastic to minimize air leakage. Avoid over-tightening connections on the spiral tapped ends to prevent deformation of the fitting.

Technical Specifications

• Larger End Diameter: 18 inches
• Smaller End Diameter: 14 inches
• Material: Hot-Dipped Galvanized Steel
• Material Thickness: 24 Gauge
• Type: Tapped, Spiral, Round
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: SP58_18X14