Southwark Metal 84ST_1-1/2X18 Ductboard Collar Tap 18 in

Product Description

The SOUTHWARK METAL 84ST_1-1/2X18 is an 18-inch ductboard collar tap designed for connecting round branch ducts to fiberglass ductboard systems. Fabricated from hot dip galvanized steel, it provides corrosion resistance suited to HVAC air distribution applications. The 1-1/2-inch tab secures the collar firmly against the ductboard face, creating a tight, low-leakage connection point. This fitting is installed by sheet metal and HVAC technicians during new construction and retrofit ductwork projects where ductboard trunk lines are used. It meets applicable ACCA and SMACNA standards for duct construction and installation.

This collar tap is used in residential and light commercial HVAC duct systems where fiberglass ductboard serves as the primary trunk or plenum material. It creates a branch takeoff point for round flexible or rigid duct connections. Typical installations include supply-air distribution systems in forced-air heating and cooling applications. The 18-inch size suits larger trunk runs or high-volume supply branches commonly found in commercial light-duty and larger residential systems.

Key Features

• 18-inch collar size for large-diameter ductboard branch connections
• 1-1/2-inch tab for positive mechanical attachment to ductboard face
• Hot dip galvanized steel construction for corrosion resistance
• Meets ACCA and SMACNA ductwork standards
• Designed for use with fiberglass ductboard trunk and plenum systems

Compatibility

Designed as an OEM-style sheet metal fitting for use with fiberglass ductboard systems in residential and light commercial forced-air HVAC installations conforming to ACCA and SMACNA duct construction standards.

Installation Notes

Installation is performed by licensed HVAC or sheet metal technicians in accordance with SMACNA Fibrous Glass Duct Construction Standards and applicable local mechanical codes. The system should be fully powered down and airflow isolated before cutting into an existing ductboard trunk. Use a sharp ductboard knife or hole saw sized to match the collar diameter, and secure the tab with mastic sealant or approved duct tape rated for fibrous glass systems to maintain an airtight seal. Do not over-compress the ductboard face when seating the collar tab, as this can damage the board facing and compromise the connection.

Technical Specifications

• Size: 18 inches
• Tab Length: 1-1/2 inches
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 84ST_1-1/2X18