Air lock in clean area

Moving from Air lock-2 to Air lock-1 pressure in pressure differential gauze increases, is it true?

Both Room Differential pressure are equal.

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pressure differential pressure should be at least 15 pascal in closed air lock.

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Air lock room-1 has to be more pressure than air lock room-2, to avoid outer atmospheric air entered into air lock room-1, otherwise which may lead to contamination.

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Pressure of entry airlock1 will be lower than entry airlock 2


The reason behind this is, air change per hour And air change per hour of air lock-1 is maximum than air lock-2.
this both statement are true.

Air lock 1 to greater then Air lock 2 minimum 15 Pascal and ACPH is as per class maintain

Thank you Sir