[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. Brand reputation: Choose NBID brand products with good reputation and credibility to avoid buying inferior products.
2. Observe the filter: The filter should be uniform, without obvious damage or deformation.
