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Production facilities that must be kept within the established standards for pressure and permissible micro-particle size are classified as clean rooms. A proper filtration system is essential for sterile products and sensitive equipment. Filters are one of the most essential elements of an air purification system.
Features of filters for clean rooms
Traditional air filters are not able to provide the level of microclimate purification required in pharmacology, microelectronics, food and medical industries, laboratories, space, optical, radio engineering and aviation production facilities. Cleanroom filters prevent the entry of microclimates into the room:
- organic particles – plant pollen, cellulose, microorganisms;
- metal emissions – nickel, mercury, copper, lead;
- inorganic dust – particles of granite, asbestos, cement, gypsum, talc;
- toxic impurities – harmful gases, viruses, chemical compounds, aerosol components, which are formed as a result of population activity and natural processes.
The body of the filter element can be made of aluminum, plastic, MDF or galvanized steel. The polyurethane sealant is cast by an automated casting machine. The filter also has a protective mesh to prevent mechanical damage to the filter material.
Types of cleanroom filters
The quality of functioning of the ventilation system depends on the degree of purification of air masses by filtering devices. According to this parameter air cleaning filters for clean rooms are divided into 4 types.
- Coarse cleaning. These include devices of classes G1 to G4 according to international regulations. They are used in purification systems as the primary link. They retain from 60% of contamination of large particles larger than 1 micron. They are manufactured in the form of mesh of different densities or thin sponges.
- Fine Cleaning. Classes – F5-F9. They are installed in ventilation systems at the place of the second stage of purification. Through them will not penetrate 75% of particles, the size of 0.4 microns, such as mold spores, fine dust, plant pollen, down. Structurally, they repeat the products of class G, but the filter cloth has a higher density. They are mainly made of polypropylene fibers and polyester.
- High efficiency filtration. Classes from HEPA 10 to HEPA 14. Filters retain particles smaller than 0.3 microns and dust retention rates of 99.9%. Hepa filters for cleanrooms provide a finishing clean. They completely rid the atmosphere of the space from micro pollutants, allergens, bacteria, dangerous viruses, dust particles. The material of manufacture is fiberglass folded corrugated. The fiber sheet is placed in plastic or metal housings.
Achieve maximum cleanliness of the air masses entering the room by installing a multi-level filtration system.
Recommendations for the use of filters in clean rooms
Filters should be properly selected by studying in detail the characteristics of each filter and the requirements of the filtration plant for the filter cloth. Special attention should be paid to filters designed to retain chemical and molecular contaminants.
Expiration dates of products are indicated on the product, about 3-5 years, but for quality work it is worth changing them every year.
