For a 10ft by 20ft by 10ft cleanroom with 600CFM of airflow, there would be 18ACH. To put that in persective, that would mean the air is changed out 18 times per hour.
When designing and commisioning new air systems, it is important to understand how many air changes are taking place. A greater number of air changes per hour helps eliminate odors and fumes quickly and can provide fresh air for combustion or filtered air for aseptic processing.
ASHRAE reccommends 5 ACH for a kitchen to provide enough ventilation for smoke, smells, and combustion from gas appliances.
For airborn infectious isolation rooms used for COVID-19 or other contagious diseases are recommended to have 6 to 12 ACH.
For an ISO grade clean rooms:
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