This set includes:

• ISO 14644-1:1999 - Cleanrooms and associated controlled environments -- Part 1: Classification of air cleanliness

  This part of ISO 14644 covers the classification of air cleanliness in cleanrooms and associated controlled environments exclusively in terms of concentration of airborne particles. Only particle populations having cumulative distributions based on threshold (lower limit) sizes ranging from 0,1 mm to 5 mm are considered for classification purposes.
  
  This part of ISO 14644 does not provide for classification of particle populations that are outside of the specified particle size range, 0,1 mm to 5 mm. Concentrations of ultrafine particles (particles smaller than 0,1 mm) and macroparticles (particles larger than 5 mm) may be used to quantify these populations in terms of U descriptors and M descriptors, respectively.
  
  This part of ISO 14644 cannot be used to characterize the physical, chemical, radiological, or viable nature of airborne particles.

• ISO 14644-2:2000 - Cleanrooms and associated controlled environments -- Part 2: Specifications for testing and monitoring to prove continued compliance with ISO 14644-1

  This part of ISO 14644 specifies requirements for periodic testing of a cleanroom or clean zone to prove its continued compliance with ISO 14644-1 for the designated classification of airborne particulate cleanliness.

  These requirements invoke the test described in ISO 14644-1 for classification of a cleanroom or clean zone. Additional tests are also specified, to be carried out in accordance with the requirements of this part of ISO 14644.

  Optional tests, to be applied at the user's discretion, are also identified. This part of ISO 14644 also specifies requirements for monitoring of a cleanroom or clean zone (hereafter referred to as an installation) to provide evidence of its continued compliance with ISO 14644-1 for the designated classification of airborne particulate.