Analysis shows there are about 500 000 to 1 million particles per cubic feet of air.
Iso 9 clean room.
This standard includes the cleanroom classes iso 1 iso 2 iso 3 iso 4 iso 5 iso 6 iso 7 iso 8 and iso 9 with iso 1 being the cleanest and iso 9 the dirtiest class but still cleaner than a regular room.
For instance class 7 cleanroom class 10 000 should contain no more than 2 930 ppm of particulates that are less than 5 microns in size or 352 000 ppm of particulates less than 0 5 microns per cubic meter of room area.
The primary authority in the us and canada is the iso classification system iso 14644 1.
The former applies to clean rooms in general see table below.
Cleanroom design and construction.
Iso 14644 1 and iso 14698 are non governmental standards developed by the international organization for standardization iso.
The latter to cleanrooms where biocontamination may be an issue.
An iso 1 is the cleanest whereas an iso 9 is the dirtiest status for cleanroom standards.
Ordinary room air is around class 1 000 000 or iso 9.
Methods for evaluating and measuring cleanrooms and associated controlled environments.
Terms definitions and units.
Cleanroom testing for compliance.
Iso 14644 1 and iso 14698.