The purpose of the filter
A. Widely used in internal combustion engine equipment, such as automobiles, ships, generator sets, construction machinery
B, all kinds of industries with high air quality requirements, such as electronics, medicine, chemical industry, food industry
C, family use, such as air purifiers, air conditioners, etc

Filter classification
According to the purpose of the automobile filter classification:
1. Oil filter (oil grid) is used to filter oil;
2, the air filter (air grid, style) is used to filter the combustion air in the internal combustion engine;
3, the fuel filter is used to filter diesel or gasoline for combustion in the internal combustion engine;
4, the air conditioning filter (fourth filter) is used to filter the air in the vehicle compartment.

Classification by material
Oil filter, iron shell, paper core 2 kinds;
Air filter: divided into upper and lower iron cover, foam glue, injection molding three categories
Fuel filter:
Gasoline filters can be divided into two categories: iron shell (electric injection) and plastic shell (carburetor)

Diesel filter: iron shell, paper core 2 types

Air conditioning filter: glass fiber, activated carbon glass fiber (electrostatic adsorption) 2 kinds