Air Flow Products 84DB218 Duct Board Tab Takeoff 18 in

Product Description

The AIR FLOW PRODUCTS 84DB218 is an 18-inch duct board tab takeoff designed for connecting branch ducts to duct board trunk systems. Tab takeoffs create a secure, low-leakage connection point where a branch run splits from the main duct. This fitting is part of the 84DB product family and is installed by HVAC technicians during new construction and retrofit duct fabrication work. The tab design allows the fitting to be inserted into a cut opening in the duct board and locked in place without additional mechanical fasteners, simplifying installation in tight plenum spaces.

This takeoff is used in residential and light commercial HVAC duct systems built with fiber duct board. It is suited for supply air distribution runs where a branch connection must be made off a duct board main trunk. Installers working with duct board systems will find this fitting compatible with standard 84-series duct board fabrication methods. It is appropriate for jobs where rigid duct board construction is specified by mechanical drawings or energy codes.

Key Features

• 18-inch diameter tab takeoff for duct board trunk connections
• Tab retention design locks fitting into duct board without additional hardware
• Part of the 84DB series for consistent fitment across duct board applications
• Supports low-leakage branch connections in supply air distribution systems

Compatibility

Designed as an OEM-style replacement and new-installation fitting for 84-series duct board tab takeoff applications in residential and light commercial supply air duct systems.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal mechanics. Power down the air handling unit and confirm the system is de-energized before cutting into any existing duct board trunk. Use a straightedge and utility knife to score a clean opening in the duct board to match the fitting diameter. Seal all joints with UL 181B-rated mastic or approved tape per local mechanical code requirements.

Technical Specifications

• Size: 18 inches
• Series: 84DB
• Product Type: Duct Board Tab Takeoff

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 84DB218