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Contamination Control of Cleanrooms

The control of materials and personnel into and out of cleanrooms and other controlled areas is an important part of contamination control. The main source of contamination in cleanrooms is from people and this risk is increased by the transfer of people within a facility.

A second, and equally problematic source of risk is from trolley wheels and truck traffic. Both activities can release particles, which will be deposited into the air-stream, and some of which will settle onto surfaces depending upon air distribution.

For a cleanroom to function properly, particle levels need to be controlled below the classification of the area. Cleanrooms and clean zones in critical environments are typically classified according to their use (the main activity within each room or zone), controlled through the physical operation of heating, ventilation and air conditioning (HVAC), with the classification confirmed by the measurement of the airborne particle concentration.

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