Southwark Metal ATT_20IN Sheet Metal Duct Takeoff 20 Inch

Product Description

The SOUTHWARK METAL ATT_20IN is a 20-inch diameter Air-Tite sheet metal duct takeoff fabricated from hot-dip galvanized steel. Duct takeoffs are branch fittings that connect a main trunk duct to a run-out duct, directing conditioned air to individual supply registers or diffusers. The Air-Tite design provides a tighter fit at the trunk connection, reducing air leakage at the branch point. This fitting is installed by HVAC technicians and sheet metal mechanics during new construction or duct renovation work in commercial and residential forced-air systems.

This takeoff is suited for supply and return duct systems that require a reliable, low-leakage branch connection at 20 inches in diameter. It is appropriate for commercial and residential HVAC installations where SMACNA and ACCA standards govern duct construction and airflow design. Typical applications include large-diameter trunk-and-branch duct layouts in rooftop unit systems, air handling unit installations, and high-volume forced-air systems where maintaining duct integrity at branch points is critical to system performance.

Key Features

• 20-inch diameter sizing fits large-trunk duct systems and high-volume supply runs
• Air-Tite construction reduces air leakage at the trunk-to-branch connection point
• Hot-dip galvanized steel provides corrosion resistance for long service life in conditioned air applications
• Meets SMACNA and ACCA applicable standards for sheet metal duct fabrication and airflow performance

Compatibility

Designed as a standard sheet metal duct takeoff fitting for use in forced-air HVAC duct systems constructed to SMACNA and ACCA standards. Verify trunk duct gauge, connection method, and local mechanical code requirements before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal mechanic. Shut down and lock out the air handling unit before cutting into or modifying any duct section. Secure the takeoff to the trunk duct using fasteners and seal all joints with UL 181-rated mastic or foil tape in accordance with local mechanical codes and SMACNA guidelines. Do not rely on duct tape alone to seal the connection.

Technical Specifications

• Diameter: 20 inches
• Material: Hot-Dip Galvanized Steel
• Type: Air-Tite Sheet Metal Duct Takeoff
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ATT_20IN