Air Filter is a kind of air filtration devices. It is generally used for cleaning dust in a clean shop, clean rooms, laboratories and clean rooms, or for protecting electro-mechanical communication equipment from dust. The Air Filter models include the primary efficiency air filter, medium efficiency air filter, high efficiency air filter and sub-efficient filter and others with different standards and performance. Primary efficiency air filter It is usually made of man-made fiber filter material and its frame is made of sturdy, moisture-proof cardboard. It will not be deformed, broken, twisted in the normal operating environment. In addition to fixing filter material in the form of diagonal around the frame, filter material and frame are tightly bonded to prevent form leaking air. Pleating filter can accumulate large amounts of dust and put the dust at the bottom of it, then its sides can effectively filter other dust. Generally speaking, the deeper the pleating is, the longer service life it has.