US 11,767,997 B2
System and method for access control using differential air pressure
Thomas P. Naughton, Groton, MA (US)
Assigned to JOHNSON CONTROLS TYCO IP HOLDINGS LLP, Milwaukee, WI (US)
Filed by Johnson Controls Tyco IP Holdings LLP, Milwaukee, WI (US)
Filed on Aug. 17, 2022, as Appl. No. 17/890,108.
Application 17/890,108 is a continuation of application No. 16/355,305, filed on Mar. 15, 2019, granted, now 11,435,098.
Prior Publication US 2022/0404046 A1, Dec. 22, 2022
Int. Cl. F24F 11/00 (2018.01); F24F 11/72 (2018.01); F24F 11/77 (2018.01); F24F 110/40 (2018.01); F24F 11/35 (2018.01)
CPC F24F 11/0001 (2013.01) [F24F 11/35 (2018.01); F24F 11/72 (2018.01); F24F 11/77 (2018.01); E05Y 2900/132 (2013.01); F24F 2011/0004 (2013.01); F24F 2110/40 (2018.01); F24F 2221/50 (2013.01); F24F 2221/56 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving a trigger command for controlling a ventilation system;
determining that the trigger command relates to opening an entrance door, wherein the entrance door is swingable about an axis;
determining a swinging direction of the entrance door for opening the entrance door;
determining, based on the swinging direction, a polarity for an opening differential air pressure between opposite sides of the entrance door for opening or for easing an opening of the entrance door; and
inducing the opening differential air pressure between the opposite sides of the entrance door in response to the trigger command.