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The air filter is different from the air conditioner filter element. The air filter filters the engine air and also filters dust and particles. The air conditioner filter element filters the air conditioner air, such as turning on the air conditioner or external circulation, to filter dust and pollen. The following are related introductions: 1. The function of the air filter element is to finely filter the air entering the engine cylinder to ensure that sufficient and clean air enters the cylinder. Whether it can be kept clean and unobstructed is related to the life of the engine. Under normal circumstances, the vehicle should be replaced once every six months or 10,000 kilometers. It is best to replace it once every three months when the car is used under severe smog or catkins. 2. The function of the air-conditioning filter element is to filter the air that enters the compartment from the outside to improve the cleanliness of the air, provide a good air environment for the people in the car, and protect the health of the people in the car. Under normal circumstances, it is recommended to replace it once every six months. It can also be determined according to the external environment of the driving. If the environment is relatively humid or the haze is high, the replacement cycle can be shortened appropriately.