Southwark Metal 15_18X8 Trunk Duct Angle 18x8 in

Product Description

The SOUTHWARK METAL 15_18X8 is a 45-degree shortway trunk duct angle fabricated from hot dip galvanized steel for use in forced-air HVAC duct systems. This fitting features a vertical, radius-throat design that redirects rectangular trunk duct runs at a 45-degree angle while minimizing turbulence and static pressure loss in the airstream. The galvanized steel construction resists corrosion in typical attic, basement, and crawlspace installations. The fitting measures 18 inches by 8 inches on both the inlet and outlet ends, making it a same-size transition with no reduction in duct cross-section. HVAC sheet metal mechanics and duct installers use this fitting when a layout requires a shortway 45-degree turn in a trunk run.

This trunk duct angle is suited for residential and light commercial forced-air duct systems where rectangular trunk ducts must change direction at a 45-degree angle. The shortway orientation means the turn is made on the narrow dimension of the duct, which is common in tight framing or joist-bay installations. Both the inlet and outlet dimensions are 18 inches by 8 inches, so the fitting maintains consistent duct sizing through the turn. The radius throat geometry promotes smooth airflow and aligns with ACCA and SMACNA duct design standards commonly specified on commercial and residential mechanical drawings.

Key Features

• 45-degree shortway angle for direction changes on the narrow duct dimension
• Vertical, radius-throat design reduces turbulence and pressure drop through the fitting
• Hot dip galvanized steel construction provides corrosion resistance in unconditioned spaces
• Same-size 18 x 8 inch inlet and outlet — no cross-section reduction through the fitting
• Meets ACCA and SMACNA applicable standards for duct fabrication and performance

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems with an 18 x 8 inch duct size, conforming to ACCA and SMACNA duct construction standards.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal mechanic familiar with SMACNA duct construction practices. Power down the air handler or furnace and shut off system controls before working on any connected duct sections. Secure the fitting using appropriate sheet metal screws and seal all joints with UL 181-listed duct sealant or mastic per applicable mechanical codes. Support the fitting independently if the duct run spans an open bay to prevent stress on adjoining duct sections.

Technical Specifications

• Angle: 45 degrees
• Type: Shortway, Vertical, Radius Throat
• Inlet Size (Size A): 18 x 8 inches
• Outlet Size (Size B): 18 x 8 inches
• Material: Hot Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 15_18X8