Southwark Metal ATSD_18IN 18 Inch Round Duct Takeoff

Product Description

The SOUTHWARK METAL ATSD_18IN is an 18-inch round, Air-Tite sheet metal duct takeoff constructed from hot-dipped galvanized steel. It ships complete with an integrated scoop and damper, giving installers a single assembly that handles both airflow capture and volume control at the branch connection. The galvanized steel construction resists corrosion in typical forced-air duct environments. This takeoff is designed for use by licensed HVAC technicians and sheet metal contractors working to ACCA and SMACNA standards on residential and light commercial forced-air distribution systems.

The ATSD_18IN fits into trunk-and-branch duct layouts where an 18-inch round branch must be tapped off a main rectangular or round trunk. The included scoop improves airflow entry into the branch, and the built-in damper allows the technician to balance the system at the takeoff point rather than relying solely on downstream registers or grilles. This combination is well suited for larger branch runs common in commercial rooftop and larger residential split-system installations.

Key Features

• 18-inch diameter inlet and outlet for consistent round duct connections
• Air-Tite construction reduces air leakage at the branch takeoff point
• Integrated scoop promotes efficient airflow capture from the main trunk
• Built-in damper enables on-site system balancing and volume control
• Hot-dipped galvanized steel resists corrosion in standard duct environments
• Manufactured to ACCA and SMACNA applicable standards

Compatibility

Designed as an OEM-style replacement and new-installation component for 18-inch round branch connections in residential and light commercial forced-air duct systems built to ACCA and SMACNA specifications.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with SMACNA duct construction standards and local mechanical codes. Shut down and lock out the air handling unit before making any duct penetrations or fastening the takeoff to the main trunk. Secure the takeoff with sheet metal screws and seal all joints with listed duct sealant or mastic per local code requirements. Set the damper position during system commissioning and balancing, and verify that the damper operator is accessible for future adjustment.

Technical Specifications

• Material: Hot-Dipped Galvanized Steel
• Type: Air-Tite, Round
• Size A (Inlet Diameter): 18 inches
• Size B (Outlet Diameter): 18 inches
• Inclusions: Scoop, Damper
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ATSD_18IN