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 Clean Room Concepts |
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CLEANING AIR Federal standards have been established for room air cleanliness which describe how clean the air is in a given area. Per Federal Standard 209E, numeric classification means how many particles larger than 0.5 microns are acceptable within a classified clean environment. Hence, a Class 100 environment would mean that no more than 100 particles larger than 0.5 microns would exist in any given cubic foot of air, Class 1,000 would mean 1,000 particles and so on. Air Crafters clean rooms, enclosures and laminar flow work stations will remove airborne particles through HEPA or ULPA filtration of air entering an environment. Our standard HEPA filter will intercept and trap 99.99% of all particles 0.3 microns or larger, to meet or exceed Class 100 standards for particulate control. The use of ULPA filtration will boost your environment classification to Class 10. The required level of cleanliness will vary from process to process.
LAMINAR FLOW When the total air volume within a space moves in one direction at a uniform speed of between 70 - 120 FPM, its individual molecules assume parallel paths, or streamlines. The physics of this phenomenon allow for these streamlines of air to bend around objects and obstacles without losing laminarity or losing the particles which they carry. Maintaining air flow laminarity within clean areas -and around and over your processes- will keep airborne contaminants (emanating from workers, nearby shedding processes and products) from fouling your critical process. The principle of laminar air flow is vital in contamination control. Air flow laminarity is a major component in the design and maintenance of clean environments.
WHAT IS A MICRON? A micron (micrometer) is one-millionth of a meter, (10-6m). In the English system, a micron equals approximately 0.000003937 inch. Some examples of relative size might be useful for comparison purposes. Typically, the naked eye can see particles only as small as 40 microns; a human hair is approximately 100 microns in diameter; milled flour can contain particles as small as 1 micron; tobacco smoke is composed of particles as minute as .01 microns and as large as 1 micron; bacteria range in size from 0.3 microns to 30 microns.
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