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The AIR FLOW PRODUCTS EC09 is a tee end cap designed to terminate or close off the open end of a tee fitting in duct or ventilation distribution systems. At 9 inches, this end cap provides a secure, finished closure that prevents airflow loss and keeps the system sealed at unused tee outlets. It is a standard component used by HVAC technicians and sheet metal installers working on residential and light commercial duct systems. The part number designation and sizing conform to the 88-series fitting line, making it a straightforward match for compatible tee assemblies in that product family.
This end cap is suited for use in forced-air HVAC duct systems where a branch tee outlet is not in active use and requires a clean, sealed termination. It is typically installed during new construction duct layout or during retrofit work where a branch is capped off after system redesign. The 9-inch sizing fits standard round or oval duct tee openings of that nominal diameter within the applicable fitting series.
Designed as an OEM-style end cap for 9-inch tee fittings within the AIR FLOW PRODUCTS 88-series duct fitting line.
Installation is typically performed by a licensed HVAC technician or sheet metal mechanic. Power down the air handling unit and verify the system is not pressurized before working on duct connections. The end cap should be seated fully on the tee outlet and secured with appropriate fasteners or duct tape rated for HVAC applications in accordance with local mechanical code requirements.
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