Southwark Metal 14_18X8 Trunk Duct Elbow 18x8 90 Degree

Product Description

The SOUTHWARK METAL 14_18X8 is a flat, Broadway-style sheet metal trunk duct elbow designed for rectangular HVAC ductwork transitions and direction changes. Built from hot dip galvanized steel, this fitting delivers a 90-degree turn at a consistent 18 inches x 8 inches cross-section on both the inlet and outlet. The radius throat design reduces turbulence and static pressure loss compared to square-throat fittings. It is installed by sheet metal workers and HVAC technicians as part of low-pressure supply or return trunk systems in forced-air heating and cooling applications.

This elbow fits residential and light commercial forced-air HVAC systems where rectangular trunk ductwork requires a 90-degree direction change without a size transition. The Broadway flat profile suits installations with limited ceiling or plenum clearance. Both the inlet and outlet measure 18 inches x 8 inches, making it a straight-size fitting with no reduction. It is appropriate for new construction and retrofit duct systems fabricated to SMACNA and ACCA standards.

Key Features

• 90-degree angle for perpendicular trunk duct routing
• Consistent 18 inches x 8 inches size on both ends — no taper or transition
• Hot dip galvanized steel construction for corrosion resistance in conditioned air applications
• Flat, Broadway profile suited for low-clearance plenum and ceiling chase installations
• Radius throat design reduces airflow turbulence and static pressure loss
• Fabricated to ACCA and SMACNA applicable standards

Compatibility

Designed as an OEM-style sheet metal fitting for rectangular trunk duct systems requiring a 90-degree flat elbow at 18 inches x 8 inches. Suitable for low-pressure forced-air supply and return duct assemblies built to SMACNA and ACCA standards.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal workers following SMACNA duct construction standards. Secure the fitting to adjoining ductwork using sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per local mechanical code requirements. Power down the air handling equipment before connecting to or modifying any section of the duct system. Ensure the fitting is adequately supported per applicable mechanical code to prevent sagging or joint separation.

Technical Specifications

• Angle: 90 degrees
• Size A (Inlet): 18 inches x 8 inches
• Size B (Outlet): 18 inches 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: 14_18X8