Southwark Metal 16_18X8 Trunk Duct Elbow 18x8 Shortway 90 Degree

Product Description

The SOUTHWARK METAL 16_18X8 is a 90-degree sheet metal trunk duct elbow designed for rectangular duct systems in forced-air HVAC applications. Built from hot dip galvanized steel, this shortway elbow features a vertical orientation with a radius throat, allowing directional duct transitions in tight mechanical spaces where a longway elbow will not fit. Both the inlet and outlet measure 18 inches by 8 inches, making this a same-size transition fitting. HVAC sheet metal mechanics and duct installers rely on this type of fitting to maintain airflow direction while minimizing turbulence through the radius throat geometry. Fabricated to meet ACCA and SMACNA standards, this elbow is suited for residential and light commercial duct system construction and service work.

This elbow is used in rectangular trunk duct systems where a 90-degree turn is required in a vertical plane and space constraints call for a shortway configuration. The shortway design reduces the elbow depth compared to a longway version, making it practical in confined mechanical rooms, attic installations, and tight equipment closets. The radius throat reduces pressure drop across the turn compared to a square-throat elbow, supporting better system airflow performance. Installation is performed by licensed HVAC technicians or qualified sheet metal workers following SMACNA duct construction standards.

Key Features

• 90-degree turn angle for standard duct direction changes
• Shortway vertical configuration fits confined installation spaces
• Radius throat design reduces pressure drop and turbulence at the elbow
• Hot dip galvanized steel construction for corrosion resistance in HVAC environments
• Consistent 18 inch by 8 inch sizing on both inlet and outlet
• Meets ACCA and SMACNA applicable standards for duct fabrication

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems in residential and light commercial forced-air HVAC installations requiring a 90-degree shortway elbow at 18 inches by 8 inches.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal workers. Power down the air handling unit and verify the system is de-energized before beginning any duct modification work. Secure connections with sheet metal screws and seal all joints with UL 181-rated mastic or metal foil tape in accordance with local mechanical codes and SMACNA duct construction guidelines. Do not use standard cloth duct tape as a primary sealant on metal duct systems.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size A (Inlet): 18 inches x 8 inches
• Size B (Outlet): 18 inches x 8 inches
• Angle: 90 degrees
• Type: Shortway, Vertical, Radius Throat
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 16_18X8