Air filter is the main equipment of air purification technology, and the process standards of air filter manufacturers are crucial to creating an air purification environment.

According to the filtration efficiency classification of the filter, it can generally be divided into initial effect, medium effect, secondary effect, secondary effect and air filter. The classification method based on filtration efficiency is a common and commonly used method, which is briefly introduced as follows:

Primary filter: mainly used for pre-filtration, should retain larger particles, mainly suspended particles, higher than sp.m and higher than 10 microns of sediment particles and various foreign bodies, to prevent their entry into the system, so the efficiency of the coarse filter equipment is based on the 5 micron filter.

Medium filter: Because it has a pre-filter in the front, it is mainly used as a filter and a pre-filter for general air conditioning system filters. It is mainly used to intercept suspensions of 1-10 microns. For particles, efficiency is based on 1 micron filtration.

Sub-mechanical filter: can be used as a general purification system end filter. It can also improve the purification effect of the system and better care for the filter. As an intermediate filter, it is mainly used to intercept 1-5 microns. The efficiency of the suspended particles is also filtered.

Secondary filter: can be used as a clean room end filter to achieve the highest degree of air cleanliness. It can also be used as a pre-filter for filters to further ensure the cleanliness of the air supply. It can also be used as a novelty air filter. Improve the quality of novel air. Therefore, like the filter, it is mainly used to capture submicron particles below 1 micron, with efficiency based on 0.5 micron filtration.

Filter: It is an important filter in clean rooms and is designed to achieve cleanliness of 0.5 micron, but its efficiency is based on 0.3 micron filtration. If further subdivided, in order to achieve a cleanliness of 0.1 micron, the efficiency is based on a 0.1 micron filter, which we call a filter.

Air filters have made great efforts to promote the vigorous progress of the food cleaning and sterilization industry. There are many sterilization methods, and the corresponding sterilization equipment is also many. However, with the requirements of production and the improvement of people's living standards, the safety and nutrition needs of food are also increasing.

In order to reduce environmental pollution in the food workshop, air filters are installed in the workshop and disinfected. However, many small and medium-sized food companies operate on thin margins and have limited funds to use expensive disinfection equipment. It is understood that many small and medium-sized food processing companies are unable to build standard clean production workshops. The traditional standard cleaning shop is equipped with a medium-sized, efficient filtration and purification ventilation system with a central air conditioning system. Even with the transformation, future maintenance costs are a heavy burden for companies with thin margins.