Southwark Metal 13_18X8 Trunk Duct Angle 18x8 45 Degree

Product Description

The SOUTHWARK METAL 13_18X8 is a 45-degree sheet metal trunk duct angle designed for rectangular duct transitions in forced-air HVAC systems. Fabricated from hot-dip galvanized steel, this fitting features a flat, Broadway-style configuration with a radius throat to reduce turbulence and maintain airflow efficiency through directional changes. It transitions from an 18 x 8 inch opening to an 18 x 8 inch opening, making it a straight-angle fitting for in-line direction changes without size reduction. Licensed HVAC sheet metal installers and mechanical contractors are the primary end users of this component.

This trunk duct angle is used in residential and light commercial forced-air duct systems where a 45-degree directional change is required in rectangular trunk lines. The Broadway flat configuration suits installations where ceiling or wall clearance is limited. The radius throat design minimizes static pressure loss at the turn, supporting balanced airflow across the duct run. It meets ACCA and SMACNA standards, making it suitable for systems designed and installed to those specifications.

Key Features

• 45-degree angle for directional trunk duct transitions
• Hot-dip galvanized steel construction resists corrosion in exposed or semi-conditioned spaces
• Radius throat reduces static pressure loss and turbulence at the turn
• Broadway flat profile accommodates tight clearance installations
• Consistent 18 x 8 inch inlet and outlet sizing simplifies inline installation
• Fabricated to ACCA and SMACNA standards

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems built to ACCA and SMACNA standards. Fits inline with 18 x 8 inch rectangular duct sections.

Installation Notes

Installation should be performed by a licensed sheet metal mechanic or HVAC technician following SMACNA duct construction standards. Power down the air handling unit before working on any connected duct section. Secure the fitting to adjoining duct sections using sheet metal screws and seal all joints with UL-listed duct sealant or approved mastic per local mechanical code requirements. Do not modify the radius throat geometry, as alterations will affect airflow performance.

Technical Specifications

• Angle: 45 degrees
• Size A: 18 x 8 inches
• Size B: 18 x 8 inches
• Type: Flat, Broadway, Radius Throat
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 13_18X8