Air Flow Products 840-1-RATD20-000008 Stick-on Takeoff with Damper

Product Description

The AIR FLOW PRODUCTS 840-1-RATD20-000008 is an airtight stick-on takeoff designed for round pipe duct systems and fitted with an integrated damper for airflow control. This fitting connects branch round pipe runs directly to rectangular sheet metal trunk duct without cutting or welding, using an adhesive-backed gasket to form an airtight seal. The unit ships with a 2-inch standoff and accepts an 8-inch round collar. HVAC sheet metal installers and duct fabricators use this fitting during new construction and retrofit projects where controlled, sealed branch takeoffs are required.

This takeoff is suited for residential and light commercial forced-air HVAC ductwork installations. The integrated damper allows the installer to balance airflow at the branch point, reducing the need for separate balancing dampers downstream. The 2-inch standoff positions the branch collar away from the trunk duct face, providing clearance for insulation wrap or tight plenum spaces. It is typically installed on main supply trunk ducts feeding room supply branches.

Key Features

• Airtight adhesive-backed gasket seals directly to rectangular trunk duct surface
• Integrated damper allows airflow balancing at the takeoff point
• 8-inch round collar fits standard 8-inch flex or rigid round duct
• 2-inch standoff provides clearance for insulation or tight plenum conditions
• Stick-on installation eliminates the need for trunk duct cutting in compatible applications

Compatibility

Designed as an OEM-style airtight stick-on takeoff for use with rectangular sheet metal trunk duct systems accepting 8-inch round branch connections.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal installers. Power down the air handling unit and confirm the system is de-energized before beginning duct work. Clean and dry the trunk duct surface thoroughly before applying the adhesive gasket to ensure an airtight bond. Follow local mechanical codes and SMACNA duct construction standards for branch takeoff placement and damper accessibility requirements.

Technical Specifications

• Round Collar Size: 8 inches
• Standoff Height: 2 inches
• Seal Type: Airtight adhesive stick-on gasket
• Damper: Integrated

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 840-1-RATD20-000008