To create the cleanest environment possible, airborne pollutants, including dust, germs, and aerosol particles, are filtered out in cleanrooms, which are controlled environments. Electronics, pharmaceuticals, and medical equipment are the most common things manufactured in cleanrooms.
Cleanrooms eliminate impurities, particulates, and pollutants from the ambient outdoor air. Before entering a filter system, outside air is cycled. This outdoor air is subsequently cleaned and decontaminated following the filters’ requirements (HEPA or ULPA). The cleanroom is then pushed with filtered air. Additionally, the process is restarted when polluted air in the cleanroom is forced outside the space by registers or circulated back into the filters.
- According to how pure the air is, cleanrooms are categorized, The number of particles equal to and more than 0.5 mm is measured in one cubic foot of air and used to classify the cleanroom following Federal Standard 209 (A to D) of the USA.
- The most recent 209E version of the Standard also accepts this metric name. Domestically, Federal Standard 209E is applied. The International Standards Organization’s TC 209 is the more recent Standard.
- A clean room is categorized under both criteria based on how many particles are in the laboratory’s air.
- To classify the cleanliness level of a cleanroom or clean area, the cleanroom classification standards FS 209E and ISO 14644-1 call for precise particle count measurements and calculations.
- British Standard 5295 is used to categorize cleanrooms in the UK. The BS EN ISO 14644-1 standard is about to replace this.
- Cleanrooms are categorized according to the number and size of particles allowed per air volume. According to FED STD-209E, large values like “class 100” or “class 1000” refer to the maximum number of particles that can fit inside a cubic foot of air.
- The Standard also permits interpolation, allowing for the description of something like “class 2000”.
- The decimal logarithm of the number of particles 0.1 mm or more significant allowed per cubic meter of air is specified in ISO 14644-1 standard, referred to as “small numbers.”
- As an illustration, an ISO class 5 clean room has 105 = 100,000 maximum particles per m3. Particle size and concentration are assumed to have log-log correlations in both FS 209E and ISO 14644-1.
- Zero particle concentration does not exist for this reason. Class 1,000,000, or ISO 9, roughly describes the air in a typical room.