Single Pass Versus Recirculating Clean Rooms
What is the difference between a single-pass clean rooms and a recirculating clean rooms?
There is really not an enormous difference between a single-pass clean room and a recirculating clean rooms the main difference is that it has to do with the preciseness of how you control the return.
In any cleanroom you are pushing air down into the room then transferring the air out of the clean room. The difference between a single-pass clean room and a recirculating clean rooms is what you do with that air after it is purged out of the room:
- Are you going to return that air back to the plenum, or,
- Are you going to let that air return to the surrounding areas?
Temperature and Humidity Control Precision in Recirculating Clean Rooms
The decision of which method to use should be made depending of the desired preciseness of your control. If you are controlling temperature and humidity very tightly, you want to use a recirculating system so that once you’ve conditioned that air, you are not letting the conditioned air escape.
The good side of a single pass cleanroom is that when you purge the air out of the cleanroom you are allowing that air to fill up the surrounding area, therefore, creating an external “cleaner” environment that is being conditioned by the clean air from the inner cleanroom.
When making a decision on whether to use a single-pass clean room and a recirculating clean rooms, will be dependent on the control or tightness of the temperature and humidity more so than the control or tightness of the particle count.
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