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

Claim 0:
1. A heating, ventilation, or air conditioning (HVAC) system for a zone of a building, comprising:
an air handler configured to pass unfiltered air through a filter and output filtered air to the zone of the building;
an in-zone filtration device, the in-zone filtration device configured to draw air from the zone into an inner volume, filter the air, and recirculate the filtered air to the zone of the building; and
a controller comprising processing circuitry configured to:
determine whether to apply additional air filtration 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 the in-zone filtration device is capable of providing; and
in response to determining to apply additional air filtration, activating the in-zone filtration device to recirculate the filtered air to the zone of the building.