Improved stability of the static pressure in a cleanroom environment

In order to protect cleanrooms from contamination from adjacent less clean spaces, the cleanroom must be built airtight and maintain an (over)pressure of sufficient magnitude and stability. For this magnitude there are guidelines. However, there is a lack of guidelines for the required stability of the pressure. As a result, an unstable pressure could result in an undefined air direction and increase the risk of contamination. This unstable pressure occurs especially during entering the cleanroom with an airtight cleanroom. In this paper the pressure and the entrance of the cleanroom are modellated in a Simulink© environment. The model is verified and validated. The main problem addressed here is that the airtightness and the stability of the pressure are in conflict with each other. It is concluded that the new proposed adjustment increases the stability of the pressure in the cleanroom and enhances the precision of control.