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The AIR FLOW PRODUCTS 84RATD14 is an airtight stick-on takeoff fitting designed for round duct pipe with an integrated damper. This fitting connects branch runs to main trunk ducts in forced-air HVAC systems, providing a sealed, low-leakage transition point where conditioned air is diverted from the main duct into a branch line. The built-in damper allows airflow balancing at the takeoff point, giving the installer control over distribution to individual zones or rooms. At 14 inches, this fitting suits larger trunk duct applications where higher airflow capacity is required. HVAC sheet metal technicians and duct installers are the primary trades that specify and install this fitting.
This takeoff is suited for residential and light commercial forced-air duct systems where airtight construction is required to meet energy codes or commissioning standards. The stick-on design allows the fitting to be mounted directly to flat or curved duct surfaces without cutting a collar hole in advance, streamlining field installation on new construction and retrofit trunk duct runs. The integrated damper makes it appropriate for systems that require branch-level airflow adjustment during balancing.
Designed as an OEM-style replacement and new-installation fitting for 14-inch round branch duct connections in residential and light commercial forced-air HVAC duct systems.
Installation is typically performed by a licensed HVAC technician or qualified sheet metal installer. The HVAC system should be powered down and the air handler shut off before fitting installation to prevent debris from entering the duct system. Seams and edges should be sealed with listed duct mastic or UL 181-rated tape to maintain the airtight rating after mounting. Local mechanical codes, including applicable sections of the IMC or SMACNA duct construction standards, should be consulted for proper takeoff placement and airflow balancing requirements.
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