Air Flow Products 840-1-ATD200-000004 Stick-on Takeoff Damper

Product Description

The AIR FLOW PRODUCTS 840-1-ATD200-000004 is an airtight stick-on takeoff fitting with an integrated damper, designed for use with flat duct systems. The fitting measures 4 inches in diameter with a 2-inch standoff, allowing it to mount flush to flat duct and extend into the branch run with minimal obstruction. The built-in damper provides manual airflow control at the takeoff point without requiring a separate balancing component. This type of fitting is installed by licensed HVAC technicians during new duct construction or duct modification work in residential and light commercial applications.

This takeoff is suited for flat duct installations where airtight performance and branch airflow regulation are required at a single fitting. The stick-on design simplifies installation by adhering directly to the flat duct surface, eliminating the need for sheet metal cutting tools in some configurations. It is commonly used in trunk-and-branch supply duct systems where balanced airflow distribution across multiple zones or rooms is the installation goal.

Key Features

• Airtight construction minimizes air leakage at the branch takeoff connection
• Integrated damper allows airflow balancing without a separate fitting
• Stick-on mounting method attaches directly to flat duct surface
• 4-inch collar size fits standard branch duct connections
• 2-inch standoff provides clearance for branch duct connection at the takeoff

Compatibility

Designed as an OEM-style replacement or new-installation fitting for flat duct supply systems requiring an airtight stick-on takeoff with integrated damper.

Installation Notes

Installation is performed by licensed HVAC technicians. Shut down the air handling unit and confirm the system is de-energized before cutting into or modifying any duct section. Ensure the flat duct surface is clean and free of debris before adhering the fitting to achieve a proper airtight seal. Duct installation should conform to ACCA Manual D and applicable local mechanical codes.

Technical Specifications

• Collar Size: 4 inches
• Standoff Height: 2 inches
• Duct Type: Flat Duct
• Damper: Integrated
• Mounting Type: Stick-On

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 840-1-ATD200-000004