Southwark Metal 84ST_2X8 Ductboard Collar 8 Inch

Product Description

The SOUTHWARK METAL 84ST_2X8 is an 8-inch ductboard collar start fitting fabricated from hot dip galvanized steel. It is designed to connect sheet metal ductwork to ductboard panels, forming a secure, air-tight transition at the collar start point. The 2-inch tab allows for positive engagement with ductboard edges, holding the fitting in position during assembly. HVAC installers use this fitting during new construction and retrofit work where fiberglass ductboard systems meet sheet metal supply or return runs. The galvanized steel construction resists corrosion in attic, crawlspace, and mechanical room environments.

This collar start fitting is used in residential and light commercial HVAC duct systems where ductboard panels are the primary distribution material. It is installed at the takeoff or transition point where a rigid duct section begins or where a ductboard run terminates into a sheet metal collar. The 2-inch tab design simplifies alignment and secures the fitting to the ductboard face during stapling or taping. This part is suited for low-pressure supply and return air applications typical of split-system and air handler installations.

Key Features

• 8-inch collar size for standard ductboard system connections
• 2-inch tab provides positive mechanical engagement with ductboard panels
• Hot dip galvanized steel construction for corrosion resistance
• Meets ACCA and SMACNA applicable standards for sheet metal duct fittings
• Compatible with conventional low-pressure residential and light commercial duct systems

Compatibility

Designed as an OEM-style replacement and new-installation fitting for residential and light commercial HVAC ductboard systems requiring an 8-inch collar start with a 2-inch tab configuration.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal workers in accordance with SMACNA and ACCA duct construction guidelines. Shut down the air handling equipment and confirm the system is de-energized before beginning duct modifications. Secure the fitting to the ductboard panel using approved staples and foil-faced tape or mastic sealant per local mechanical code requirements. Do not over-compress the ductboard edge at the tab interface, as this can compromise the air seal.

Technical Specifications

• Size: 8 inches
• Tab Size: 2 inches
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 84ST_2X8