US 12,085,308 B2
Air conditioning system
Mitsuru Sekizawa, Tokyo (JP); Yuuiti Sato, Tokyo (JP); and Kazuhito Matsuzaki, Tokyo (JP)
Assigned to Hitachi Global Life Solutions, Inc., Tokyo (JP)
Filed by Hitachi Global Life Solutions, Inc., Tokyo (JP)
Filed on Mar. 24, 2023, as Appl. No. 18/125,819.
Application 18/125,819 is a continuation of application No. 17/760,708, granted, now 11,649,975, previously published as PCT/JP2019/047441, filed on Dec. 4, 2019.
Prior Publication US 2023/0228433 A1, Jul. 20, 2023
Int. Cl. F24F 7/06 (2006.01); F24F 11/74 (2018.01)
CPC F24F 7/06 (2013.01) [F24F 11/74 (2018.01)] 8 Claims
OG exemplary drawing
 
1. An air conditioning system, comprising:
a first unit including a first fan configured to supply air to a first clean room of a plurality of clean rooms from a chamber including a space above a ceiling of the first clean room; and
a second unit including a second fan configured to return the air from the first clean room through the chamber,
wherein the space above the ceiling of each of the plurality of clean rooms included in the chamber is a single space common to the plurality of the clean rooms,
wherein each of the plurality of clean rooms includes the first clean room in which the second unit is configured to return air from the first clean room to the chamber via a duct shaft, and also includes a second clean room in which the air is exhausted from the first clean room to outside thereof, without using any duct shaft, and
wherein the first clean room is higher than the second clean room in air cleanliness, and
wherein air in the second clean room is not returned to the chamber.