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Particles and Class Type and size of particles Although the sizes of particles vary according to their types, they are generally in the range of 0.0001~10,000micron. Particle size Particle type Micron Cleanliness level (Class) Application area Over 5Micron Industrial dust Visible dust Rain particle Hair 100 ~ 8,500 10~10,000 300 ~ 3,500 70 ~ 100 10,000~100,000 Precision ceramic works General medicine production Food processing including dairy products and live products Dust-causing industries including cement and grass fiber Over 0.3Micron General dust Airborne ash Respiratory organ disease generation Fog Bacteria 1 ~ 100 0.3 ~ 80 0.5 ~ 10 3 ~ 40 0.35~10 100~10,000 Electronic devices such as Braun tube, computer, magnetic      tape Precision equipment such as clocks and miniature bearings Under 0.3Micron Smog Cigarette smoke Virus 0.01~1 0.07~0.3 0.01~0.2 10~100 Ultra-precision processing of semi-conductor, IC and LSI Antibiotics, injection material, serum production Operating room, special sick wards Clean-Room Specs In general, the US Federal Specifications are used to maintain the cleanliness level of clean-rooms and the NASA specifications are used to maintain the germ level. The summary is as follows. ICR Specifications   Particle Positive pressure Temperature Humidity Air current Calibration Grain size ¥ì Number of accumulate particles (EA/ft3) mm Aq Range ¡É Set value ¡É Error ¡É Max % Min % Error % LUX CLASS 100 ¡Ã 0.5 (100) over 1.25 19.4 ~ 25 22.2 ¡¾2.8 ¡¾0.28 45 30 ¡¾10 ¡¾5 Laminar-flow mode 0.45m/s ¡¾0.1m/s 1,080 ~ 1,620 CLASS 10,000 ¡Ã 0.5 ¡Ã 5.0 (10,000) (65) Turbulent-flow mode ¡¾20/hr CLASS 100,000 ¡Ã 0.5 ¡Ã 5.0 (100,000) (700) BCR Specifications Number of bacteria (EA/1ft3) Number of fallen bacteria in 1 week (EA/1ft3 week) 0.1 1,200 0.5 6,000 2.5 30,000

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