Clean room classification is a standardized system categorizing enclosed spaces based on maximum allowable airborne particle concentrations. The ISO 14644-1 standard defines nine classes (ISO Class 1 through Class 9) using particle counts per cubic meter. Classification ensures consistent contamination control across different industries and facilities.
Technical Details
ISO Class 5 is the most stringent commonly used classification, allowing no more than 3,520 particles larger than 0.5 micrometers per cubic meter. ISO Class 8 allows up to 3.52 million particles at the same size. Each classification level represents a tenfold increase in allowable particle concentration. Cleanroom classification is verified through particle counting at specific locations and intervals.
Applications
ISO Class 5 cleanrooms are required for pharmaceutical sterile product manufacturing. ISO Class 6 and 7 are used in medical device assembly and general pharmaceutical operations. ISO Class 8 and 9 are acceptable for food processing and non-critical manufacturing.
Practical Significance
Classification affects HVAC design complexity and operational costs significantly. Higher classifications demand more frequent air changes and stricter control protocols, directly impacting facility expenses.