Air Devices Used in Hospital

An air cleaning device has been developed, with which a room in a general hospital ward can be converted into a biological clean room. Measurements inside the unit showed that the particle concentration (particle diameter .GEQ.0.5.MU.m) was reduced from 240,000/ft'3' to 100/ft'3' after operation. However, when an air conditioner was used simultaneously, it decreased to only 3,000/ft'3', so two layers of a medium efficiency particulate filter were installed over the exit of the air conditioner, which improved the particle concentration to 1,000/ft'3'. No airborne microbes were detected inside the unit. This result shows that the device is effective for the prevention of infection during the myelo-suppressive period of chemotherapy. A major advantage is that it can be easily installed without any construction.