Positive Pressure Clean Room

This is in contrast to a negative pressure room where air is sucked in.

Positive pressure clean room.

A positive air pressure cleanroom has an air pressure level that is greater than that of the surrounding environment. When the door of the cleanroom is opened or if the cleanroom experiences a structural breach the pressure disparity forces. In medical settings these rooms prevent the spread of infectious contaminants and maintain sterile or restricted spaces and are also referred to as protective environments positive pressure rooms and airborne infection isolation rooms aiir negative pressure rooms. Effective positive and negative pressure rooms are an important part of industrial climate control systems.

Use is also made of positive pressure to ensure there is no ingress of the environment. With cleaned air being sucked in and contaminants being ejected positive pressure cleanrooms are classified according to the concentration of airborne particles inside of them and the size of those particles the goal being to minimize the number and size of the particles in a clean room through. There are different cascading levels of positive air pressure from the cleanest rooms at the highest pressure down to the gown room or airlock room. In the event that there was a leak or a door opened clean air would be forced out of the cleanroom rather than unfiltered air being allowed into the cleanroom.

Consequently if there is any leak from the positively pressured system it will egress into the surrounding environment. Positive pressure is used in cleanrooms where the priority is keeping any possible germs or contaminants out of the cleanroom.