With economic development while also increasing environmental pollution, people's environmental awareness is gradually strengthened, air quality has become an important field of worldwide concern. Air filter not only confined to the field of the protection of industrial machinery and equipment, more lives have been deeply protective of human health. Air filters in the electronic equipment is centralized telecommunications room, public buildings, such as airports, railway stations indoor kind is more important. Chicago D'Hare airport hall air flow rate is about 51.66 million m3 per minute, in order to improve air quality, the department with a total of 1100 pre-filter air filter, 1100 and 2200 final filter carbon filter air filter (one of the carbon need to be replaced every 10-12 months once). Factory equipment often produce large polluting gases, particles, factory area of ??air pollution, the supplemental air before distribution to the workplace must be filtered. A typical example: pharmaceutical, semiconductor manufacturing industry, there is a higher air cleanliness requirements. Semiconductor production per cubic foot of air requirement is less than with a particle and the environment in general per cubic foot of air containing particles of more than 500,000. Therefore, workplaces need to use the air through HEPA filters clean the air constantly cleaning cycle. For factory emissions, the same stringent quality requirements. Such as heavy metals such as mercury, arsenic, chromium, beryllium and other toxic, and its very strict emissions limits. In the toxicity of the air filter, the United States and Germany have adopted a new, more stringent legislation. After the implementation of the new legislation, limiting toxic air original 20mg/m3 (standard) down to 010004mg/m3 (standard). To achieve this goal, the plant needs more advanced air filters to remove submicron particles. Some German companies using traditional folding fine glass fiber HEPA air filters for the filtration system, cooperate with pulse air cleaning mechanism, and make corrugated filter media is more dense. 

palabras clave: Air filter,