Southwark Metal ATD447 Air-tite Takeoff 7 Inches Collar with Model 44 Damper 28 Gauge Galvanized Steel

Product Description

The Southwark Metal ATD447 is a 7-inch Air-Tite Takeoff collar with a Model 44 damper, built for HVAC duct distribution systems in residential and light commercial applications. This fitting connects a main trunk duct to a branch duct run, providing a secure and sealed tap point that controls airflow at the source. HVAC installers and sheet metal contractors rely on takeoff collars like the ATD447 to balance airflow throughout a forced-air system. The integrated damper allows technicians to adjust or shut off flow to individual zones or rooms without cutting into the ductwork after installation. The ATD447 is manufactured from 28-gauge hot-dipped galvanized steel, meeting ASTM A653 CS Type B standards. Galvanized construction resists corrosion and extends service life in both conditioned and unconditioned spaces such as attics, crawlspaces, and mechanical rooms. The collar tube measures 5 and 3 quarters inches in length with a 1 and 1 half inches crimp length, making it compatible with standard flexible duct and rigid branch fittings. A 1 and 1 half inches wide, 1 eighth inches thick neoprene foam gasket is factory-applied with high-tack adhesive coating. This gasket seals against the trunk duct surface to minimize air leakage and improve system efficiency. The fitting includes 4 pre-drilled screw holes for fast, secure attachment to the trunk without additional layout work. The Model 44 damper is constructed from 26-gauge steel with an 18-gauge handle. The handle is secured with a wingnut locking mechanism, allowing for precise positioning and reliable hold after adjustment. The ATD447 is pressure-rated at plus or minus 4 inches water gauge, suitable for low-pressure forced-air duct systems. It is Made in the USA and flanged for easy installation.

• 28-gauge hot-dipped galvanized steel construction per ASTM A653 CS Type B for long-lasting corrosion resistance
• Integrated Model 44 damper with 26-gauge body and 18-gauge locking wingnut handle for reliable airflow control
• Factory-applied 1 and 1 half inches wide neoprene foam gasket with high-tack adhesive for airtight sealing against trunk duct

Product Highlights

The Southwark Metal ATD447 delivers a complete, ready-to-install air-tite takeoff solution with a built-in damper and sealed gasket, reducing installation time and improving duct system airtightness for HVAC professionals.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ATD447

Technical Specifications

• Diameter: 7 inches
• Gauge: 28 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: Plus or minus 4 inches water gauge
• Pre-Drilled Screw Holes: 4
• Damper Gauge: 26 GA with 18 GA handle
• Country of Origin: USA
• Unit of Measure: Each
• Weight: 1.06 pounds
• Prop 65: Yes