Air Flow Products 84RAT18 Airtight Stick-on Round Takeoff

Product Description

The AIR FLOW PRODUCTS 84RAT18 is an airtight stick-on takeoff fitting designed for round duct pipe connections in forced-air HVAC systems. This 18-inch fitting uses an adhesive mounting method that bonds directly to the main duct surface, eliminating the need for sheet metal screws or additional fasteners at the collar. The airtight design reduces conditioned air loss at the branch takeoff point, which is a common source of duct leakage in both new construction and retrofit ductwork. HVAC sheet metal installers and duct fabricators are the primary trades that work with this type of fitting.

The 84RAT18 is suited for residential and light commercial forced-air HVAC installations where round branch takeoffs are required from a main trunk duct. The stick-on application method makes it a practical choice in tight ceiling or attic spaces where driving sheet metal screws into a main trunk is difficult or not preferred. The 18-inch diameter accommodates high-volume branch runs in larger duct systems. No compatibility with specific equipment models is specified by the manufacturer for this fitting.

Key Features

• Airtight construction minimizes conditioned air loss at the branch takeoff collar
• Stick-on adhesive mounting eliminates the need for sheet metal screws at the connection point
• Round profile at 18 inches suits high-volume branch duct runs
• Designed for straightforward field installation in new construction and retrofit applications

Compatibility

Designed as an OEM-style replacement and new-installation round branch takeoff fitting for residential and light commercial round duct systems where an 18-inch branch connection is required.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal installer. The main trunk duct surface should be clean, dry, and free of dust or debris before adhering the fitting to ensure a proper seal. Shut down the air handling unit before cutting into or modifying any section of the duct system. Local mechanical codes and SMACNA ductwork standards should be followed for branch takeoff placement, spacing, and sealing requirements.

Technical Specifications

• Connection Type: Round
• Takeoff Diameter: 18 inches
• Mounting Method: Stick-On Adhesive

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 84RAT18