US 12,405,027 B2
Air intake filter assemblies with a multi-level fine filter for heating, ventilation, and/or air conditioning (HVAC) systems
Zhiwei Huang, Moore, OK (US); and Curtis A. Trammell, Norman, OK (US)
Assigned to JOHNSON CONTROLS LIGHT COMMERCIAL IP GMBH, Neuhausen am Rheinfall (CH)
Filed by Johnson Controls Tyco IP Holdings LLP, Milwaukee, WI (US)
Filed on Aug. 21, 2023, as Appl. No. 18/236,298.
Application 18/236,298 is a continuation of application No. 16/287,804, filed on Feb. 27, 2019, granted, now 11,732,924.
Claims priority of provisional application 62/803,116, filed on Feb. 8, 2019.
Prior Publication US 2023/0392825 A1, Dec. 7, 2023
Int. Cl. F24F 13/28 (2006.01); B01D 46/42 (2006.01); B01D 46/44 (2006.01); B01D 46/46 (2006.01); B01D 46/52 (2006.01); B01D 46/62 (2022.01); F24F 8/108 (2021.01); F24F 8/90 (2021.01); B01D 46/79 (2022.01)
CPC F24F 13/28 (2013.01) [B01D 46/4263 (2013.01); B01D 46/446 (2013.01); B01D 46/448 (2013.01); B01D 46/46 (2013.01); B01D 46/522 (2013.01); B01D 46/523 (2013.01); B01D 46/645 (2022.01); F24F 8/108 (2021.01); F24F 8/90 (2021.01); B01D 46/79 (2022.01); B01D 2275/10 (2013.01); B01D 2279/50 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A filter system, comprising:
a filter assembly configured to filter debris from an airflow drawn through the filter assembly via operation of one or more fans;
a control panel;
a water spray jet communicatively coupled to the control panel and configured to discharge a spray of water across the filter assembly; and
a pressure sensor communicatively coupled to the control panel and configured to measure a pressure of the airflow, wherein the control panel is configured to send one or more signals to activate the water spray jet and to deactivate the one or more fans in response to a determination that a pressure drop across the filter assembly exceeds a predetermined pressure threshold value.