Southwark Metal 23AT_28X8 Duct Collar Takeoff 28x8 to 14x16

Product Description

The SOUTHWARK METAL 23AT_28X8 is a sheet metal trunk duct collar takeoff designed to transition airflow from a 28-inch by 8-inch trunk duct to a 14-inch by 16-inch collar opening. Fabricated from hot dip galvanized steel, this fitting provides a durable, corrosion-resistant transition point within forced-air distribution systems. It meets applicable standards set by ACCA and SMACNA, making it suitable for code-compliant residential and light commercial ductwork installations. HVAC sheet metal mechanics and installers rely on this type of collar takeoff to maintain proper airflow geometry when branching or stepping down trunk duct dimensions.

This collar takeoff is used in forced-air HVAC systems where the main trunk duct requires a transition fitting to redirect or reduce airflow into a branch run or riser. It is well suited for low-rise residential and light commercial applications where duct systems are designed to ACCA Manual D or SMACNA standards. The galvanized steel construction stands up to the temperature cycling and humidity conditions typical inside air handling ducts. Installers working on new construction or retrofit duct systems will use this fitting to maintain system balance and minimize turbulence at the transition point.

Key Features

• Transitions from a 28-inch by 8-inch trunk duct to a 14-inch by 16-inch collar opening
• Hot dip galvanized steel construction for corrosion resistance and long service life
• Meets ACCA and SMACNA applicable standards for duct fabrication and system design
• Sheet metal construction supports secure connection to standard trunk duct sections
• Suitable for residential and light commercial forced-air distribution systems

Compatibility

Designed as an OEM-style sheet metal transition fitting for use in forced-air duct systems with a 28-inch by 8-inch trunk duct inlet and a 14-inch by 16-inch collar outlet, fabricated to ACCA and SMACNA standards.

Installation Notes

Installation should be performed by a qualified HVAC sheet metal mechanic familiar with SMACNA duct construction standards. Shut down the air handling unit and lock out power before cutting into or connecting to an existing trunk duct. Secure all joints with appropriate fasteners and seal with UL 181-rated mastic or foil tape per applicable mechanical code requirements. Do not force the fitting into an opening of a different dimension, as improper fitment will compromise airflow performance and structural integrity.

Technical Specifications

• Inlet Size: 28 inches x 8 inches
• Outlet Size: 14 inches x 16 inches
• Material: Hot Dip Galvanized Steel
• Type: Transition
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 23AT_28X8