US 12,435,901 B2
Critical area recirculation and exhaust system
Ethan Conrad Davis, Winnipeg (CA); Jordan Ashley Rose Enns, Winnipeg (CA); and David Surminski, Winnipeg (CA)
Assigned to Price Industries Limited, Winnipeg (CA)
Filed by Price Industries Limited, Winnipeg (CA)
Filed on Aug. 31, 2022, as Appl. No. 17/900,451.
Claims priority of provisional application 63/242,804, filed on Sep. 10, 2021.
Prior Publication US 2023/0083631 A1, Mar. 16, 2023
Int. Cl. F24F 13/06 (2006.01); F24F 3/167 (2021.01); F24F 7/06 (2006.01); F24F 13/28 (2006.01)
CPC F24F 13/06 (2013.01) [F24F 3/167 (2021.01); F24F 7/065 (2013.01); F24F 13/28 (2013.01); F24F 2013/0616 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A critical area recirculation and exhaust system for a room comprising:
a. an air handler connected to a room supply air duct for providing room supply air to an airflow device;
b. a room return air duct for receiving air from the room and returning the air to the air handler;
c. the airflow device comprising:
i. a diffuser with a diffuser housing and having:
(a) an air supply inlet for receiving supply air from the air handler through the room supply inlet into the diffuser housing;
(b) an air outlet for delivering air from the diffuser housing to the room; and
ii. a fan filter unit having:
(a) a chamber connected to the diffuser housing and including an air passage between the chamber and the diffuser housing;
(b) a return air inlet for receiving contaminated air from the room;
(c) an exhaust air outlet from the chamber;
(d) a filter positioned between the return air inlet and the chamber; and
(e) a fan for drawing air from the room through the room air inlet into the chamber and expelling air either through the passage to the diffuser housing or through an exhaust air duct;
d. the exhaust air duct connected to the exhaust air outlet and having an exhaust air duct damper, the exhaust air duct configured for receiving air from the exhaust air outlet and exhausting air in the chamber to a location outside of the room; and
e. a room return air duct damper for the room return air duct,
wherein in a normal operating mode, the room return air duct damper is open, the exhaust air duct damper is closed, and the fan in the fan filter unit is deactivated; and
wherein in an isolation operating mode, the room return air duct damper is closed, the exhaust air duct damper is open, and the fan of the fan filter unit is activated to draw contaminated air from the room through the filter of the fan filter unit and expel the filtered air into the diffuser and through the exhaust air duct in order to create a negative pressure in the room.