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Clean rooms

Clean rooms

Clean rooms

Clean rooms - an areas designed for scientific research, medical and diagnostic purposes, providing increased requirements for sterility environment. Typically, the design of clean rooms covers a wide range of techniques, prevents bacteria, dirt and other particles in the premises: protective clothing, chemical and biological protection, the behavior of staff, the organization of the labor process, means of sterilization and disinfection airlock. But the main method is to install air filters and air flows (whether turbulent laminar). The most reliable filters are classes HEPA and ULPA.

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Clean room - the basis of the organization:

The frame can be a solid (a room in a building, structure constant) and soft (deployable skeleton - mostly made of plastic or fabric, at least - made of glass, can be supplemented with modules). The first type is used in infectious hospitals, research institutes, the second type - in the military field hospitals, emergency services.

Clean room is classified by the degree of air purification, used in Russia at the ISO standards and its own regional standards.

Cleanliness classification scheme, according to EN ISO 14644-1, is characterized mathematically consistent approach and is based on the following formula:

CN = 10N (0,1 / D) • 2,08,

where CN - the maximum number of particles with a certain diameter in a cubic meter (particle diameter rounded to three decimal places);

N - Classification number ISO;

D - diameter of the particles;

  • - reference diameter of the constant dimension of microns.

Rooms ISO Class 1 contains 10 or more particle size of 0.1 microns. Class rooms ISO 100 comprises two or more particle size of 0.1 microns, etc. up to the 10th grade.

The laminar flow of air - it orderly movement from one room to the other end, is often used in medical clean rooms. Turbulent motion of air particles chaotic mixing causing the interpenetration of individual volumes of air and therefore is much more intense than in the laminar flow regime.

Non-unidirectional airflow system uses the principles of turbulence to clear the air of impurities while using laminar systems with filters of high purity. Principle of operation: mixing the air volume in one part of the room with the redistribution of contaminants and subsequent isolation by a laminar way.

HEPA-filter (High Efficiency Particulate Air Filter) is translated as "high-efficiency filter to clean the air from particles." These mechanical filters are made of special fine fiber material. The fibers form a porous material that retains particles having a size of 0.3 microns.

In the standard classification (the Russian GOST 51251-99 and European standards EN 779-93, EN 1822-98) HEPA filters are denoted by classes H10 to H14.

Air filter ULPA - a filter ultra transmittance of less than 0.3 microns, has even higher efficiency at 99,9995%.