Southwark Metal 84ST2_12IN Ductboard Collar 12 Inch Round

Product Description

The SOUTHWARK METAL 84ST2_12IN is a round sheet metal ductboard collar start fitting designed to create a clean, secure transition point from ductboard into round duct runs. Constructed from hot dip galvanized steel, this collar provides durable corrosion resistance in typical HVAC duct system environments. The 1.5-inch tab design locks into ductboard panels for a tight, low-leak connection. At 12 inches in diameter, this fitting suits standard residential and light commercial supply and return duct layouts. HVAC technicians and sheet metal installers use this type of collar as a starting point when fabricating or retrofitting ductboard plenum and trunk systems.

This fitting is used in forced-air HVAC systems where ductboard is the primary duct material. It is installed at the point where a round branch duct originates from a ductboard trunk, plenum, or air handler box. It is suited for new construction installations as well as replacement work in residential and light commercial settings. Sheet metal contractors and HVAC installers incorporate this collar into layouts designed and specified under ACCA and SMACNA standards for duct fabrication and performance.

Key Features

• Hot dip galvanized steel construction for corrosion resistance in conditioned air environments
• 1.5-inch tab provides a positive mechanical lock into ductboard panels
• 12-inch round diameter fits standard branch duct sizes in residential and light commercial systems
• Designed and applicable under ACCA and SMACNA ductwork standards
• Round collar geometry ensures consistent airflow entry into round duct runs

Compatibility

Designed as an OEM-style replacement and new-installation collar for use with standard ductboard panels in residential and light commercial forced-air HVAC duct systems. Suitable for applications specified under ACCA and SMACNA duct construction standards.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal contractors. Power down the air handling unit and close any dampers before cutting into an existing ductboard system. The tab is inserted and folded against the interior ductboard surface according to SMACNA installation guidelines to form the seal. Use foil-faced duct tape or mastic rated for ductboard applications to finish the connection and maintain system air tightness.

Technical Specifications

• Diameter: 12 inches
• Tab Length: 1.5 inches
• Shape: Round
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 84ST2_12IN