Southwark Metal 90-24GA_18IN Round Duct Elbow 90 Degree 18 in

Product Description

The SOUTHWARK METAL 90-24GA_18IN is a round sheet metal duct elbow designed for 90-degree directional changes in low-pressure HVAC duct systems. Fabricated from hot-dip galvanized steel at 24 gauge, it delivers reliable corrosion resistance in both supply and return air applications. The elbow measures 18 inches in diameter on both the inlet and outlet, making it a straight-dimension fitting with no offset reduction. This fitting is installed by licensed HVAC technicians and sheet metal mechanics working on commercial and residential forced-air systems where duct routing must change direction while maintaining full airflow capacity.

This elbow is suited for round duct systems requiring a true 90-degree turn at 18 inches in diameter. Common applications include trunk-to-branch transitions, mechanical room connections, and rooftop unit duct drops where a full right-angle change is needed. It conforms to ACCA and SMACNA standards, making it appropriate for code-compliant duct fabrication and installation in commercial and residential HVAC projects. Sheet metal contractors and mechanical contractors are the primary installers of this fitting type.

Key Features

• 90-degree round elbow for full right-angle duct direction changes
• Hot-dip galvanized steel construction for corrosion resistance in conditioned and unconditioned spaces
• 24-gauge material thickness for structural rigidity in standard low-pressure duct systems
• 18-inch diameter on both inlet and outlet — no reduction in duct size through the fitting
• Meets ACCA and SMACNA applicable standards for duct fabrication

Compatibility

Designed as an OEM-style round duct fitting compatible with 18-inch diameter round duct systems built to ACCA and SMACNA standards in residential and commercial forced-air HVAC applications.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed sheet metal mechanic in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handling unit before connecting or modifying any duct section. Secure the elbow to adjoining duct sections using sheet metal screws and seal all joints with UL 181-listed tape or mastic to prevent air leakage. Do not use this fitting in high-pressure duct systems unless verified against applicable pressure class ratings.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Material Thickness: 24 Gauge
• Angle: 90 Degrees
• Type: Round
• Size A (Inlet Diameter): 18 inches
• Size B (Outlet Diameter): 18 inches
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 90-24GA_18IN