Air Flow Products 840-3-RATD20-000012 Airtight Takeoff 12 in

Product Description

The AIR FLOW PRODUCTS 840-3-RATD20-000012 is an airtight stick-on takeoff fitting designed for round duct pipe installations that require a built-in damper. This fitting measures 12 inches in diameter with a 2-inch standoff, allowing it to mount directly onto round trunk lines while maintaining an airtight seal. The integrated damper gives technicians direct airflow control at the branch point without the need for a separate balancing component. HVAC installers use this fitting in residential and light commercial forced-air duct systems where branch takeoff sealing and airflow regulation are required at the same point.

This takeoff is suited for round pipe duct systems where branch runs need to be tapped off a main trunk with minimal leakage. The stick-on mounting method allows the fitting to bond directly to the duct surface, making it practical in tight plenum spaces or where cutting in a traditional collar fitting is not practical. The 2-inch standoff height provides clearance for flex duct or hard-pipe connections at the branch. This product is appropriate for new construction duct installations as well as retrofit and rebalancing work performed by licensed HVAC technicians.

Key Features

• Airtight stick-on design bonds directly to round duct trunk lines without screws or sheet metal work
• Integrated damper allows airflow regulation at the takeoff point
• 12-inch diameter opening accommodates standard round branch duct sizing
• 2-inch standoff provides clearance for flex duct or hard-pipe branch connections
• Designed to minimize duct leakage at branch takeoff locations

Compatibility

Designed as an OEM-style replacement and new-installation fitting for round pipe forced-air duct systems requiring an airtight stick-on takeoff with an integral damper.

Installation Notes

Installation should be performed by a licensed HVAC technician. Power down the air handler or furnace and close the system before cutting into or modifying ductwork. Clean and dry the duct surface thoroughly before applying the stick-on fitting to ensure a proper airtight bond. Verify local mechanical codes for duct sealing and balancing requirements prior to installation.

Technical Specifications

• Pipe Diameter: 12 inches
• Standoff Height: 2 inches
• Damper: Included
• Mounting Type: Stick-On
• Duct Type: Round Pipe

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 840-3-RATD20-000012