Patent ID: 11885510
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 7:
8. A method for providing filtered air to a zone of a building comprising:
operating an air handler to pass unfiltered air through a filter and output filtered air to the zone of the building;
determining if additional air filtration is required to satisfy a desired cumulative amount of clean airflow for the zone based on both an amount of clean airflow that is provided by the air handler, and an amount of clean airflow that an in-zone filtration device is capable of providing;
in response to determining additional air filtration is required:
activating the in-zone filtration device and operating the in-zone filtration device to draw air from the zone into an inner volume, filter the air, and recirculate the filtered air to the zone of the building.