Southwark Metal ATT_4IN Duct Takeoff 4 Inch Air-tite

Product Description

The SOUTHWARK METAL ATT_4IN is a 4-inch diameter Air-Tite sheet metal duct takeoff fabricated from hot-dip galvanized steel. Duct takeoffs connect branch ducts to a main trunk line, directing conditioned air from the plenum or trunk to individual zones or rooms. This fitting meets ACCA and SMACNA standards, making it a code-recognized component for residential and light commercial forced-air distribution systems. HVAC installers and sheet metal contractors use this fitting when building or retrofitting ductwork that requires a tight, low-leakage branch connection. The galvanized steel construction resists corrosion in typical attic, basement, and crawl space environments.

The ATT_4IN is suited for forced-air heating and cooling duct systems where a 4-inch branch takeoff is required. The Air-Tite design provides a tighter fit at the trunk connection point, reducing air leakage at the branch junction. This fitting is commonly installed in residential new construction and retrofit projects, as well as light commercial applications where SMACNA-compliant ductwork fabrication and installation practices are followed.

Key Features

• 4-inch diameter branch opening for standard round duct connections
• Air-Tite design reduces air leakage at the trunk line connection
• Hot-dip galvanized steel construction for corrosion resistance
• Meets ACCA and SMACNA applicable standards
• Suitable for residential and light commercial forced-air duct systems

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 4-inch branch connections in residential and light commercial sheet metal duct systems fabricated to SMACNA standards.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor. Shut down the air handling unit and confirm the system is depressurized before cutting into the trunk line or plenum. Seal all connections with mastic sealant or UL 181-listed tape per SMACNA and local mechanical code requirements. Sheet metal snips, hole saws, and hand seamers are typical tools for this fitting installation.

Technical Specifications

• Diameter: 4 inches
• Type: Air-Tite Duct Takeoff
• Material: Hot-Dip Galvanized Steel
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ATT_4IN