Southwark Metal ATD446 Air-tite Takeoff 6 Inches Collar with Model 44 Damper

Product Description

The Southwark Metal ATD446 is a 6-inch Air-Tite Takeoff Collar with an integrated Model 44 damper, designed for use in residential and light commercial HVAC duct systems. Takeoff collars connect branch ducts to main trunk lines or plenum boxes, directing conditioned air into individual zones or rooms. This unit is built from 26-gauge hot-dipped galvanized steel meeting ASTM A653 CS Type B standards, making it resistant to corrosion and suitable for long-term use in supply air applications. The ATD446 is a flanged collar, which allows for a secure, airtight connection to the duct system. A 1.5-inch-wide, 0.125-inch-thick neoprene foam gasket with high-tack adhesive coating is included on the flange face to create a tight, low-leakage seal when the collar is installed against a duct surface. Four pre-drilled screw holes simplify fastening and help ensure consistent pressure across the gasket. The collar has a tube length of 5.75 inches and a crimp length of 1.5 inches, making it compatible with standard flexible or rigid branch duct connections. The included Model 44 damper is fabricated from 26-gauge steel with an 18-gauge handle secured by a wingnut with a locking feature. This allows HVAC technicians and installers to set and lock airflow at the takeoff point, supporting zone balancing and system commissioning without additional hardware. The ATD446 carries a pressure rating of plus or minus 4 inches water gauge, meeting the demands of typical forced-air residential systems. Manufactured in the USA, this collar is sold individually and is part of Southwark's ATD product family. It suits sheet metal contractors, HVAC installers, and service technicians who need a reliable, code-compatible takeoff fitting with built-in damper control.

• 26-gauge hot-dipped galvanized steel construction per ASTM A653 CS Type B for corrosion resistance and durability
• Integrated Model 44 damper with 18-gauge locking handle and wingnut for precise, lockable airflow control at the branch takeoff
• Adhesive-coated neoprene foam gasket and four pre-drilled screw holes for a secure, low-leakage flanged installation

Product Highlights

The Southwark Metal ATD446 combines a flanged, gasketed 6-inch takeoff collar with a lockable volume damper, giving HVAC installers and sheet metal contractors a single fitting that handles both connection and airflow balancing in one step.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ATD446

Technical Specifications

• Diameter: 6 inches
• Gauge: 26 GA
• Material: Galvanized Steel
• Galvanized: Yes
• Flanged: Yes
• Tube Length: 5.75 inches
• Crimp Length: 1.5 inches
• Gasket Width: 1.5 inches
• Gasket Thickness: 0.125 inches
• Pressure Rating: +/- 4 inches w.g.
• Pre-Drilled Screw Holes: 4
• Damper Handle Gauge: 18 GA
• Country of Origin: USA
• Weight: 0.89 pounds
• Unit of Measure: EA
• Prop 65: Yes