The standards for Cleanroom cleanliness operate on a scale determined by the needs of specific industrial or research activities. Different levels of cleaning quality measure air suspension particle count where lower numbers relate to better cleanliness standards. The standards set by ISO 14644-1 and Chinese GMP specify complete guidelines regarding Cleanroom cleanliness levels. The classification of cleanroom environments consists of seven stages known as ISO 1 to ISO 9 whereas ISO 1 represents the highest level of cleanliness and ISO 9 represents the lowest.

Cleanroom Window is to make the Clean Room air purification function play a great role in effectively avoiding external pollution through the gap into the clean room, to prevent cross-contamination, to ensure that the clean room purification and dust-free performance.

Special attention is needed when cleaning cleanroom floors as they need to maintain a high standard of environmental cleanliness. There  are 3 methods exist different recognized techniques for cleanroom maintenance.

The ISO Cleanroom Classes use the air particles count to determine their levels starting from ISO Class 1 through ISO Class 9 where lower numbers indicate higher cleanliness standards. Under the most strict class of ISO classification known as Class 1 Cleanrooms workers must find no more than ten particles which exceed 0.1-micrometer size per cubic meter of air space. ISO Class 9 Cleanrooms serve environments which have less demanding cleanliness levels compared to other classes.