Southwark Metal 121SC9 Ductboard Snaplock Collar 9 in

Product Description

The SOUTHWARK METAL 121SC9 is a 9-inch ductboard snaplock collar designed for connecting round duct to ductboard plenums and air distribution systems. The snaplock design allows for a secure, tool-free mechanical connection that creates a tight fit between the collar and the ductboard panel. This collar is a standard component in low-pressure residential and light commercial HVAC duct systems where ductboard construction is used. HVAC technicians and sheet metal installers use this fitting during new construction and retrofit applications to maintain proper airflow integrity throughout the duct run.

The 121SC9 is suited for use in residential forced-air heating and cooling systems as well as light commercial applications where ductboard fabrication is the chosen distribution method. It installs at the point where a round branch duct transitions into a ductboard trunk or plenum, providing a consistent, sealed connection point. This collar is appropriate for horizontal and vertical duct configurations typical in attic, crawlspace, and mechanical room installations.

Key Features

• 9-inch nominal diameter fits standard round duct of the same size
• Snaplock design provides a mechanical positive-lock connection without additional fasteners
• Designed for insertion into ductboard panels for plenum and trunk applications
• Compatible with standard ductboard construction methods used in residential and light commercial HVAC

Compatibility

Designed as an OEM-style fitting for use with 9-inch round duct connections in ductboard plenum and air distribution systems built to standard HVAC ductboard fabrication practices.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal workers. Power down and lock out the air handler or furnace before beginning any ductwork modification. The collar is inserted into a field-cut hole in the ductboard panel; seal all edges with approved foil tape or duct mastic per SMACNA guidelines and local mechanical code requirements. Do not overtighten or force the collar, as ductboard panels can crack or delaminate if the connection point is stressed.

Technical Specifications

• Nominal Diameter: 9 inches
• Connection Type: Snaplock
• Application: Ductboard plenum and trunk collar

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 121SC9