How to distinguish the primary and medium efficiency filters of various filter bags?

The filter material of the primary filter bag is made of filter cotton, and the grade efficiency of the primary filter bag is G3 and G4 respectively; The primary filter bag is applicable to the front filter and air conditioning application fields of the automobile painting workshop in the coating industry, such as the air conditioning system in commercial buildings, warehouses, schools, laboratories, electronics, food and pharmaceutical, hospitals, central air conditioning and other places. The primary filter bag can also be used as the pre-filter of the medium efficiency air filter, which can reduce the load of the medium efficiency filter and extend its service life.

The grade efficiency of primary filter bag and secondary filter bag is F5, F6, F7, F8, F9, etc.

The filtration standard of medium efficiency filter is to filter dust particles with particle size of 0.5 um and above, and the filter material is generally synthetic fiber and glass fiber. When synthetic fiber filter material is used for medium efficiency filter, the process is roughly the same as that for initial efficiency filter. The outer frame of filter: aluminum alloy, galvanized sheet, paper frame, stainless steel, thickness: 21mm, 25mm, 46mm, etc., while glass fiber filter material can be used to make the process without partition and with partition 292, and the process without partition and with partition are also efficient and common process methods, thickness: 50, 70, 90, 150, etc.

Replacement cycle of bag type medium efficiency filter:

1. Or when the resistance of the intermediate efficiency filter reaches more than 400Pa, the filter must be replaced.

2. If the dust concentration in the service environment is large, the service life cycle will also be reduced.

3. Under the service condition of rated air volume, 34 months is the replacement period of bag type medium efficiency filter

1. Or when the resistance of the intermediate efficiency filter reaches more than 400Pa, the filter must be replaced.

2. If the dust concentration in the service environment is large, the service life cycle will also be reduced.

3. Under the service condition of rated air volume, the medium efficiency filter needs to be replaced within 3-4 months.

4. If the medium efficiency filter uses washable filter material, the replaced filter material can be washed and dried with clean water or solution containing neutral detergent, and then replaced; More than twice cleaning is allowed, that is, a new medium efficiency filter must be replaced.

The above is a brief introduction from the aspects of filtration efficiency, material and technology. I hope it can help you understand the difference between primary efficiency filter and medium efficiency filter.

The air filter is recognized by more and more people. It improves the air quality and ensures people's health, and has been widely used. For example, medicine, food and other industries are inseparable from various efficiency filters.