Cleanroom: definition, structure, ISO classes - Parsan

The particulate tests are done using Climet – CI-752X calibrated air particle counter. The Process for Undertaking Air Particle Counts is done as per OEM best practice guidelines. Airborne particulate testing requires to confirm the level of air quality against the Cleanroom ISO 14644-1 standard for Clean rooms.

The Process for Undertaking Air Particle Counts
as noted below:

  1. The air particle counter should be set to complete each test over a one (1) minute (sixty (60) second) period.
  2. Using a static air particle machine that has been properly calibrated collect  5 air sample per 10 square meters of room space –  in a 50square meter room a minimum of 10 tests should be taken and in 100 square meters 15 tests should be taken.
  3. The air particle meter should remain static during the test.
  4. The machine should be set to test particles at 0.5 microns and 5 microns.
  5. The exact location of each particle test should be documented and if you are looking to trend the air quality in a certain room future tests should be taken at the same location each time.
  6. The air particle meter should be at an elevated height of one (1) meter above the floor surface.
  7. During the test the machine will draw in one (1) cubic meter of air for analysis.
  8. The results of each test should be recorded. (I.e. test 1 = 3,200,000; test 2 = 2,500,012; test 3 = 832,000 etc) these results should be added together (6,532,011) and then divided by the number of tests (3) to get an average for the room (2,110.670) which in this example is a Class 8.
  9. Check against the ISO table below to identify the class achieved:

To achieve compliance with the relevant ISO standards, Cleanroom validation needs to be undertaken to ISO 14644-1:2015 – Classification of air cleanliness by particle concentration and ISO 14644-2:2015 – Monitoring to provide evidence of cleanroom performance related to air cleanliness by particle concentration.

Parsan Engineers and Consultants will issue with test certificates containing up-to-date calibration certificates for all of the equipment used as well as recommendations for improvements that could be made to make the clean room more efficient in regards to its operation.