[Working principle of car air filter]:
The car air filter filters out dust, particulate matter and impurities in the air entering the engine through the filter to ensure that the air inhaled by the engine is clean.
[How to identify the quality of the product]:
1. Observe the filter: The filter should be uniform, without obvious damage or deformation.
2. Test effect: Test the filtering effect of the product after installation to ensure filtering efficiency.
