Southwark Metal 15_20X8 Trunk Duct Angle 20x8 45 Degree

Product Description

The SOUTHWARK METAL 15_20X8 is a 45-degree sheet metal trunk duct angle fitting designed for rectangular duct systems in forced-air HVAC applications. Fabricated from hot dip galvanized steel, this fitting provides a shortway, vertical turn with a radius throat geometry — a configuration that reduces turbulence and static pressure loss at direction changes. The frame size is 20 inches x 8 inches on both the inlet and outlet, making it a same-size transition. HVAC sheet metal mechanics and ductwork installers use this type of fitting when routing trunk duct through tight spaces that require a low-profile turn.

This duct angle is suited for residential and light commercial forced-air systems where rectangular trunk duct must change direction without a change in duct size. The shortway orientation keeps the fitting depth minimal along the short dimension of the duct, which is useful in ceiling plenum and crawlspace applications where vertical clearance is limited. The radius throat design supports airflow characteristics consistent with ACCA and SMACNA ductwork standards, making it appropriate for systems designed or verified to those specifications.

Key Features

• 45-degree turn angle for moderate direction changes in trunk duct runs
• Shortway, vertical orientation minimizes depth along the 8-inch duct dimension
• Radius throat geometry reduces turbulence and pressure drop at the fitting
• Same-size inlet and outlet: 20 inches x 8 inches to 20 inches x 8 inches
• Hot dip galvanized steel construction resists corrosion in typical HVAC environments
• Meets ACCA and SMACNA applicable standards for duct fitting design

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems using 20 inches x 8 inches duct sections, consistent with ACCA and SMACNA ductwork design standards.

Installation Notes

Installation should be performed by a licensed HVAC mechanic or sheet metal worker in accordance with SMACNA duct construction standards and local mechanical codes. Shut down the air handling system before connecting or modifying any duct section. Seal all joints and seams with duct mastic or UL-listed foil tape per applicable code. Support the fitting adequately to prevent stress on adjoining duct connections.

Technical Specifications

• Angle: 45 degrees
• Frame Size: 20 inches x 8 inches
• Size A: 20 inches x 8 inches
• Size B: 20 inches x 8 inches
• Type: Shortway, Vertical, Radius Throat
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 15_20X8