Air Flow Products 840-3-RATD20-000010 Stick-on Takeoff

Product Description

The AIR FLOW PRODUCTS 840-3-RATD20-000010 is an airtight stick-on takeoff designed for round duct pipe and equipped with a built-in damper. It provides a direct branch connection from a main round trunk line, with a 2-inch standoff that positions the takeoff away from the duct surface for a clean, low-profile installation. At 10 inches, it suits standard residential and light commercial duct runs. HVAC technicians and sheet metal installers use this fitting when branching supply air from an existing round main without cutting and welding traditional collars.

This takeoff is suited for residential forced-air supply systems and light commercial applications where a secure, airtight branch connection is required on a round trunk duct. The stick-on design allows attachment directly to the duct surface, reducing installation time compared to conventional saddle or spin-in fittings. The integrated damper provides airflow balancing at the branch point, making it useful in zoned systems or multi-room duct layouts where individual branch control is needed.

Key Features

• Airtight construction minimizes conditioned-air leakage at the branch connection
• Stick-on mounting attaches directly to the round duct surface without traditional collar cutting
• Built-in damper allows airflow adjustment at the branch takeoff point
• 2-inch standoff positions the fitting clear of the duct wall for easier boot and flex-duct connection
• 10-inch size fits standard residential and light commercial round trunk duct runs

Compatibility

Designed as an OEM-style replacement or new-installation fitting for round main trunk duct systems requiring an airtight stick-on branch takeoff with damper control.

Installation Notes

Installation is typically performed by a licensed HVAC technician or qualified sheet metal installer. Shut down the air handler and confirm the system is de-energized before cutting or attaching any duct fittings. Seal all contact edges with listed duct mastic or UL 181-rated tape to maintain airtight integrity. Follow local mechanical codes and SMACNA guidelines for duct branch connection requirements.

Technical Specifications

• Size: 10 inches
• Standoff Height: 2 inches
• Damper: Included
• Mounting Type: Stick-On
• Duct Type: Round Pipe
• Airtight: Yes

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 840-3-RATD20-000010