Southwark Metal 13_20X8 Trunk Duct Angle 20x8 in 45 Deg

Product Description

The SOUTHWARK METAL 13_20X8 is a sheet metal trunk duct angle designed for directional transitions in forced-air HVAC duct systems. Fabricated from hot dip galvanized steel, this fitting delivers a 45-degree turn using a flat, Broadway-style configuration with a radius throat for smoother airflow through the bend. The inlet and outlet both measure 20 inches by 8 inches, making this a same-size transitional angle rather than a reducing fitting. It is installed by sheet metal workers and HVAC technicians during trunk line fabrication and duct system layout.

This trunk duct angle is suited for residential and light commercial forced-air systems where rectangular trunk ductwork requires a 45-degree directional change without a size reduction. The Broadway profile with radius throat is a standard configuration in low-resistance duct design, helping maintain static pressure efficiency through the turn. Installation typically occurs during new construction rough-in or duct replacement work. The 20-inch by 8-inch sizing is common in main trunk runs feeding multiple branch takeoffs.

Key Features

• 45-degree trunk duct angle for directional changes in rectangular duct systems
• Hot dip galvanized steel construction for corrosion resistance in HVAC environments
• Flat Broadway style with radius throat for reduced turbulence and improved airflow
• Same-size inlet and outlet: 20 inches by 8 inches on both ends
• Meets ACCA and SMACNA applicable standards for duct fabrication and system design

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems requiring a 45-degree flat Broadway angle with radius throat at 20 inches by 8 inches cross-section.

Installation Notes

Sheet metal workers and licensed HVAC technicians install trunk duct angles as part of the duct distribution system, following SMACNA and ACCA guidelines for sealing, support, and layout. Power down and lock out the air handling equipment before connecting or modifying any section of the duct system. Joints should be sealed with mastic or code-approved tape per local mechanical code requirements. Do not compress or deform the fitting during installation, as this will affect the radius throat geometry and airflow performance.

Technical Specifications

• Item Type: Trunk Duct Angle
• Angle: 45 degrees
• Size A: 20 inches x 8 inches
• Size B: 20 inches x 8 inches
• Style: Flat, Broadway, Radius Throat
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 13_20X8