Southwark Metal 121SC20 Ductboard Snaplock Collar 20in

Product Description

The SOUTHWARK METAL 121SC20 is a 20-inch ductboard snaplock collar designed to create secure, airtight connections between ductboard panels and round duct fittings in forced-air HVAC systems. The snaplock design allows the collar to seat firmly into ductboard without fasteners, creating a reliable mechanical connection that supports both structural integrity and airflow efficiency. This fitting is installed by HVAC technicians during new duct system construction or duct repair work where ductboard is the primary distribution material.

The 121SC20 is suited for residential and light commercial forced-air applications where ductboard is used as the primary duct material. It serves as the transition point between flat ductboard panels and round branch or trunk connections, making it a standard component in ductboard duct system assembly. Its 20-inch diameter accommodates larger trunk or branch runs common in commercial-light and larger residential installations.

Key Features

• 20-inch diameter snaplock collar for ductboard duct systems
• Snaplock design seats without additional fasteners for faster installation
• Provides a secure transition between ductboard panels and round duct connections
• Sized for larger trunk and branch duct runs

Compatibility

Designed as an OEM-style fitting for use with ductboard duct systems in residential and light commercial forced-air HVAC applications.

Installation Notes

Installation is performed by licensed HVAC technicians. Power down the air handling unit at the disconnect before working inside any duct system. The collar should be seated fully into the ductboard panel and secured with foil-backed tape rated for HVAC duct applications per local mechanical code requirements. Do not use standard vinyl tape in place of rated duct tape or mastic sealant.

Technical Specifications

• Diameter: 20 inches
• Type: Snaplock Collar
• Application: Ductboard HVAC Systems

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 121SC20