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The MM Manufacturing 800-9X7X5 is a sheet metal wye fitting designed for HVAC ductwork systems. A wye fitting splits a single duct run into two branch outlets, allowing airflow to be distributed across separate zones or runs. This fitting measures 9 inches by 7 inches by 5 inches across its three openings and weighs 1.85 pounds. It is installed by sheet metal workers and HVAC technicians during new construction and retrofit duct system work. The unit dimensions are 12 inches in length, 9 inches in width, and 14 inches in height. Its metal construction provides durability in both supply and return duct applications.
This wye fitting is suited for residential and light commercial forced-air duct systems. It is typically installed where a trunk line must branch into two separate duct runs, making it a standard component in supply-side duct distribution. HVAC technicians use this fitting when laying out or modifying duct systems that require airflow to be divided at a single junction point.
Designed as an OEM-style sheet metal wye fitting for use in residential and light commercial forced-air HVAC duct systems where a 9-inch, 7-inch, and 5-inch three-way split is required.
Installation is performed by licensed HVAC technicians or qualified sheet metal workers. Shut down the air handling unit and confirm the system is de-energized before beginning duct modifications. Secure the fitting using sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per local mechanical code requirements. Do not leave unsealed joints, as air leakage at wye connections reduces system efficiency and can cause pressure imbalance across branch runs.
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