Southwark Metal 13_20X10 Trunk Duct Angle 20x10 45 Degree

Product Description

The SOUTHWARK METAL 13_20X10 is a 45-degree sheet metal trunk duct angle designed for low-pressure forced-air duct systems. Fabricated from hot dip galvanized steel, this flat Broadway-style fitting features a radius throat that reduces turbulence at the turn. It transitions from a 20 x 10 inch opening to a 20 x 10 inch opening, making it a same-size elbow used to redirect trunk duct runs. HVAC installers and sheet metal contractors specify this type of fitting where the main trunk must change direction while maintaining the same cross-sectional area. Compliance with ACCA and SMACNA standards supports use in engineered duct systems requiring documented fitting performance.

This duct angle is suited for rectangular trunk duct systems in residential and light commercial forced-air HVAC installations. The Broadway flat style is commonly used in applications with limited vertical clearance, such as crawl spaces, low-attic chases, and between-joist runs. The 45-degree angle allows a gradual directional change that fits tighter routing situations compared to a 90-degree elbow. Sheet metal mechanics typically use this fitting as part of a fabricated trunk-and-branch duct system built to Manual D or SMACNA Low Pressure Duct Construction Standards.

Key Features

• 45-degree angle for gradual trunk direction changes in tight routing scenarios
• Flat Broadway style with radius throat for reduced airflow turbulence
• Hot dip galvanized steel construction for corrosion resistance in HVAC duct environments
• Same-size inlet and outlet: 20 x 10 inches to 20 x 10 inches
• Meets ACCA and SMACNA applicable standards for duct system fabrication

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems built to ACCA and SMACNA Low Pressure Duct Construction Standards. Compatible with 20 x 10 inch rectangular duct sections using standard slip or drive connections.

Installation Notes

Installation should be performed by a licensed HVAC technician or journeyman sheet metal mechanic. Secure all duct connections with drive cleats or S-slips and seal seams with mastic or UL 181-rated tape per SMACNA guidelines and local mechanical code. Power down the air handling unit before working on connected duct sections. Do not modify the fitting throat geometry, as the radius design is integral to the pressure drop and airflow performance the fitting was sized for.

Technical Specifications

• Angle: 45 degrees
• Size A: 20 x 10 inches
• Size B: 20 x 10 inches
• Type: Flat, Broadway, Radius Throat
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 13_20X10