Southwark Metal ATD_20IN Sheet Metal Duct Takeoff 20in Round

Product Description

The SOUTHWARK METAL ATD_20IN is a 20-inch round, Air-Tite sheet metal duct takeoff fabricated from hot-dipped galvanized steel. Duct takeoffs are used to branch airflow from a main trunk line to a secondary supply or return run, and this fitting is built to ACCA and SMACNA standards for tight-sealing, low-leakage performance. The galvanized steel construction resists corrosion in attic, crawlspace, and mechanical-room environments. HVAC installers and sheet metal mechanics use this fitting during new construction and retrofit duct system work where a 20-inch round branch connection is required.

This takeoff is suited for residential and light commercial forced-air HVAC duct systems where a 20-inch round branch outlet is needed off a main rectangular or round trunk. The Air-Tite design provides a close-fitting, sealed connection that reduces uncontrolled air leakage at the branch point, supporting system efficiency and meeting duct leakage requirements under energy codes. It is appropriate for supply or return branch applications in sheet metal duct assemblies.

Key Features

• Hot-dipped galvanized steel construction for corrosion resistance in unconditioned spaces
• Air-Tite design minimizes air leakage at the branch connection point
• 20-inch round outlet diameter for high-volume branch duct runs
• Meets ACCA and SMACNA applicable standards for sheet metal ductwork
• Round profile compatible with standard spiral and snap-lock round duct systems

Compatibility

Designed as an OEM-style sheet metal fitting for use in standard forced-air HVAC duct systems requiring a 20-inch round branch takeoff connection built to ACCA and SMACNA specifications.

Installation Notes

Installation should be performed by a licensed HVAC technician or journeyman sheet metal mechanic in accordance with SMACNA duct construction standards and applicable local mechanical codes. Shut down the air handling unit and isolate the duct section before cutting into the trunk line or making connections. Secure the takeoff with sheet metal screws and apply UL 181-rated mastic or foil tape at all joints to meet duct leakage requirements. Avoid over-driving screws into the galvanized material, which can compromise the sealing surface.

Technical Specifications

• Material: Hot Dipped Galvanized Steel
• Outlet Diameter (Size A): 20 inches
• Inlet Diameter (Size B): 20 inches
• Type: Air-Tite, Round
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ATD_20IN