Positive Pressure Clean Room Design

A negative pressure room primarily keeps its air inside the room with controlled venting only.

Positive pressure clean room design.

The cleanroom is positively pressurized to 0 05 in wc with respect to the adjacent areas. Negative and positive air pressure rooms are common in hospitals 1. More than 12 changes may be necessary depending on the room size and orientation. This is done by supplying more air and extracting less air from the room than is supplied to it.

Positive pressure rooms also require 12 minimum airflow changes per hour and are required to maintain a minimum 0 01 in wc positive pressure differential ensuring that the patient is protected from airborne contamination. Whereas a positive pressure room keeps unfiltered air from outside the room out of the room all together. There is much more into the design of cleanrooms in terms of details of technology of. 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.

The 4 important air conditioning design considerations for clean room system design are. Most homes have at least one negative pressure room. Positive pressure cleanrooms are used primarily for industries where the cleanroom functions to keep the product clean and safe from particulates like in the microelectronic industry where even the tiniest particle can damage the integrity of the microchips being manufactured. In a negative pressurised cleanroom the opposite occurs.

Positive pressure prevents dirty air from entering into the cleanroom. Effective positive and negative pressure rooms are an important part of industrial climate control systems. The airflow must be greater in the adjacent room. The pressure must be greater in more stringent classified rooms so the air leaks towards the lesser clean rooms.

If the clean area pressure differential was positive to the corridor the powder would escape out of the room and enter the corridor and is likely then to be transferred into the next door cleanroom. It is very difficult to consistently maintain a space s cleanliness classification when it has neutral or negative space pressurization. Introducing air in a manner to prevent stagnant areas where particles could accumulate. Maintaining a positive air space pressure in relation to adjoining dirtier cleanliness classification spaces is essential in preventing contaminants from infiltrating into a cleanroom.