Hospitals are places vulnerable to airborne cross-contamination. Transmission of pathogens (microorganisms that bring about diseases) is commonly through the air. This process is also widely known as airborne infection. Controlling air quality is one effective method to control airborne contamination. In facilities such as the operating theater, sterile air is needed to prevent post operation infection.
The main goal of establishing good air system in labs is to eliminate biohazard (biological hazard) infection to the environment. Biohazard infection not only affects research processes and results, it also directly affects human's health. Extra safety control measures are even more critical in microbiological research in which hazardous microorganisms potentially may infect the air.