Southwark Metal 121SC7 Ductboard Snaplock Collar 7 in

Product Description

The SOUTHWARK METAL 121SC7 is a 7-inch ductboard snaplock collar designed for connecting flexible or rigid ductboard sections in low-pressure HVAC air distribution systems. The snaplock design allows the collar to seat and lock into ductboard without additional fasteners, creating a secure, airtight transition point at the fitting. This fitting is installed by HVAC technicians during new construction or duct system repair work where ductboard is the primary duct material. The 7-inch diameter matches standard trunk-to-branch and plenum-to-run connection points found in residential and light commercial systems.

This collar is used in ducted HVAC installations where ductboard panels form the air distribution network. It is suited for residential new construction, retrofit duct work, and light commercial applications where a clean, secure collar connection is needed at a 7-inch round opening. HVAC installers use this fitting when transitioning between a ductboard plenum or trunk and a round branch run or flexible duct drop.

Key Features

• 7-inch diameter fits standard ductboard openings for branch and trunk connections
• Snaplock design secures to ductboard without additional fasteners
• Compatible with low-pressure residential and light commercial air distribution systems
• Sheet metal construction provides durability at the collar connection point

Compatibility

Designed as an OEM-style replacement and new-installation fitting for 7-inch ductboard air distribution systems in residential and light commercial HVAC applications.

Installation Notes

Installation is performed by licensed HVAC technicians. Power down the air handling unit and confirm the system is de-energized before working inside any air distribution plenum or duct section. Seat the snaplock collar firmly into the ductboard cutout and verify the lock engagement is complete around the full perimeter before connecting any branch duct. Follow local mechanical codes and SMACNA duct construction standards for sealing and support requirements.

Technical Specifications

• Diameter: 7 inches
• Type: Snaplock Collar
• Application: Ductboard Air Distribution

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 121SC7