Production plants are increasingly dependent on air filters
Air quality requirements vary greatly from plant to plant. Factories equipped with fume hoods and pollution control equipment need to replenish a large amount of air. If the ambient air in the area where these factories are located is polluted, the supplementary air must be filtered before distributing to the workplace. In the semiconductor and pharmaceutical industries, the requirements for air cleanliness are high. While a typical work environment contains 500,000 particles per cubic foot of air, the latest requirement for semiconductor production is one particle per cubic foot of air. Therefore, the workshop needs to be continuously cleaned with clean air filtered through the HEPA air filter.
In order to keep the HEPA filter clean and durable, a combination of several less efficient prefilters is required. Industrial cleanrooms require continuous and efficient removal of smaller particles. Once the most efficient filter, the HEPA filter is now the most efficient, and a new generation of more efficient filters will be developed. Fine glass fiber filter medium is the main choice of filter medium, but membrane and electrostatic enhancement media have penetrated into this field and obtained some applications.
The most stringent requirement for factory emissions is toxicity. Some heavy metals, such as mercury, arsenic, chromium and beryllium, are highly toxic and have very strict emission limits. On air toxicity, the United States and Germany have passed new, stricter legislation. Following the implementation of the new legislation, the limit for air toxicity has been reduced from the original 20mg/m3 to 010004mg/m3. To achieve this, the factory needs more advanced filters to remove submicron particles.