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Whitfield solved this problem by designing his cleanrooms with a constant, highly filtered air flow to flush out impurities in the air. [3] Within a few years of its invention, sales of Whitfield's modern cleanroom had generated more than $50 billion in sales worldwide. [3] Whitfield retired from Sandia in 1984. [4]
The modern cleanroom was invented by American physicist Willis Whitfield. [1] As an employee of the Sandia National Laboratories, Whitfield created the initial plans for the cleanroom in 1960. [1] Prior to Whitfield's invention, earlier cleanrooms often had problems with particles and unpredictable airflows.
The aim of cleanroom suitability tests is to determine the suitability of machines and operating utilities (air conditioning, venting, etc.) for use in cleanrooms. The tests must be carried out using measurement techniques as particle emission behavior cannot be adequately assessed by the naked eye or similar means.
Air showers are typically placed between a gowning area and cleanroom; after workers don appropriate garb and personal protective equipment, they enter the shower so that the pressurized air nozzles remove any residual particles from coveralls. Once the program cycle is complete, users exit through a second door into the cleanroom.
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ISO 14644-1 covers the classification of air cleanliness in cleanrooms and associated controlled environments. Classification in accordance with this standard is specified and accomplished exclusively in terms of concentration of airborne particulates. [6]
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