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This test confirms that air does not pass from dirtier adjacent areas into the higher grade clean areas .
The main function of room pressure differentails is to minimise infiltration of particles from a less clean cleanroom to a cleaner cleanroom e.g. ISO Class 7 to ISO Class 5. The cleanest area in the facility should have the highest pressure cascading out to the less clean areas. This get more complicated with negative pressure cleanrooms.
ISO 14644-4 recommends of pressure differential from room to room of 5 to 20 Pascal (0.02” to 0.08” w. g.) it is our experience that it is best to keep the differential around 10 Pascal.