During 25-27 external air temperature, 2016 Jan has been reduced to about 15-20 degrees from the normal 25-34 degrees and address humidity reduced approximately 50-60% RH from the usual 70% RH, there are about resulted in a clean room humidity decreases below the standard value. That this did not "occur frequently. When the external air temperature and humidity into the normal humidity in the clean room is located in the standard values.
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