Air Flow Products 840-3-RATD20-000016 Stick-on Takeoff with Damper

Product Description

The AIR FLOW PRODUCTS 840-3-RATD20-000016 is an airtight stick-on takeoff fitting designed for round duct pipe and equipped with an integrated damper. Sized at 16 inches with a 2-inch standoff, this fitting attaches directly to round trunk duct to create a branch tap without cutting the main line open beyond the takeoff opening. The built-in damper allows field balancing of airflow to individual zones or rooms. HVAC installers and sheet metal mechanics use this fitting in forced-air distribution systems where airtight performance at branch connections is required.

This takeoff is suited for residential and light commercial forced-air duct systems using round branch runouts. The airtight construction limits conditioned-air leakage at branch connection points, supporting system efficiency targets. The stick-on design simplifies installation on existing or new trunk duct runs, making it useful in both new construction and retrofit applications where cutting into ductwork needs to remain straightforward and well-sealed.

Key Features

• Airtight construction reduces conditioned-air leakage at branch takeoff points
• Integrated damper enables airflow balancing at the branch connection
• 16-inch fitting size for larger-volume branch duct runs
• 2-inch standoff positions the branch outlet away from the trunk duct surface
• Stick-on attachment method simplifies installation on round trunk pipe

Compatibility

Designed as an OEM-style airtight stick-on takeoff for round duct trunk pipe in residential and light commercial forced-air distribution systems.

Installation Notes

Installation is typically performed by a licensed HVAC technician or journeyman sheet metal mechanic. Power down the air handler and shut off the system before cutting the trunk duct opening and attaching the fitting. Seal all connections with code-approved duct sealant or mastic per SMACNA and local mechanical code requirements. Confirm damper operation and airflow balance after system restart.

Technical Specifications

• Fitting Size: 16 inches
• Standoff Height: 2 inches
• Connection Type: Stick-on takeoff for round pipe
• Damper: Integrated

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 840-3-RATD20-000016