Southwark Metal ATD448 Air-tite Takeoff 8 Inches Collar with Model 44 Damper

Product Description

The Southwark Metal ATD448 is an Air-Tite Takeoff with a built-in Model 44 damper, designed for use in residential and light commercial duct systems. This fitting connects a main trunk duct to a branch run, allowing controlled airflow delivery to individual zones or rooms. HVAC installers and sheet metal contractors rely on takeoff collars like the ATD448 to create precise, low-leakage branch connections in forced-air heating and cooling systems. The damper included in this unit gives technicians the ability to balance airflow after installation, a critical step in achieving even temperature distribution throughout a structure. The ATD448 features an 8-inch diameter collar, making it well suited for medium-capacity branch runs in residential ductwork layouts. It is fabricated from hot dipped galvanized steel meeting ASTM A653 CS Type B standards, which provides corrosion resistance and long service life in both conditioned and unconditioned spaces. The 28-gauge galvanized steel construction offers a balance of durability and workability for field installation. The tube length is 5 and 3 quarters inches, and the crimp length is 1 and a half inches, allowing it to mate securely with standard flexible or rigid duct branch connections. A 1 and a half inch wide by 1 eighth inch thick neoprene foam gasket with high-tack adhesive coating is included to create an airtight seal at the trunk connection, reducing air leakage and improving system efficiency. Four pre-drilled screw holes simplify mounting and ensure a solid mechanical attachment to the trunk duct. The integrated Model 44 damper is made from 26-gauge steel with an 18-gauge handle secured by a wingnut with a locking feature, making damper adjustment straightforward and reliable. The unit carries a pressure rating of plus or minus 4 inches water gauge, suitable for standard residential and light commercial HVAC applications. Manufactured in the USA and sold individually.

• 8-inch diameter collar for medium-capacity branch duct connections in residential and light commercial HVAC systems
• Integrated Model 44 damper with 26-gauge steel blade, 18-gauge locking handle, and wingnut for precise airflow balancing
• Neoprene foam gasket with high-tack adhesive coating ensures an airtight, low-leakage seal at the trunk duct connection

Product Highlights

The Southwark Metal ATD448 combines a galvanized steel Air-Tite takeoff collar with a built-in adjustable damper, giving HVAC professionals a single fitting that handles both branch connection and airflow control in one installation step.

Product Information

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: ATD448

Technical Specifications

• Diameter: 8 inches
• Gauge: 28 GA
• Material: Galvanized Steel
• 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 w.g.
• Damper Gauge: 26 GA blade, 18 GA handle
• Flanged: Yes
• Galvanized: Yes
• Pre-Drilled Screw Holes: 4
• Height: 6 inches
• Length: 11 inches
• Width: 11 inches
• Weight: 1.24 pounds
• Country of Origin: USA
• Unit of Measure: EA
• Prop 65: Yes