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The AIR FLOW PRODUCTS 84RAT05 is an airtight stick-on takeoff designed for round duct pipe in forced-air HVAC systems. This fitting attaches directly to the main trunk or branch duct using an adhesive-backed, airtight seal, eliminating the need for sheet metal screws or additional sealant at the takeoff connection point. With a 5-inch round opening, it is sized for standard residential supply branch runs. HVAC sheet metal installers and duct fabricators are the primary trades that install this component during new construction and renovation ductwork projects.
The 84RAT05 is suited for residential and light commercial forced-air duct systems where branch takeoffs are required from a main trunk line. Its airtight design helps reduce conditioned air loss at the connection point, supporting system efficiency without requiring additional mastic or tape at the fitting interface. The 5-inch diameter matches standard flexible duct and rigid round pipe sizes commonly used in supply branch runs.
Designed as an OEM-style replacement and new-installation fitting for round-pipe branch takeoff connections in residential and light commercial forced-air duct systems.
Installation is typically performed by licensed HVAC technicians or sheet metal workers during ductwork rough-in or system retrofit. Power down the air handler and shut off the system before cutting into an existing trunk line. Ensure the duct surface is clean, dry, and free of dust or grease before applying the adhesive-backed fitting to achieve a proper airtight seal. Local mechanical codes, including applicable IMC or SMACNA standards, should be consulted for duct sealing and takeoff placement requirements.
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