Can an air filter still be used after being stored for 4 years?

[VonConnor]

An air filter can still be used after being stored for 4 years. Below are the specific functions of a car's air conditioning filter: 1. Filtering air: It ensures the filter fits tightly against the housing, preventing unfiltered air from entering the cabin. 2. Separating impurities: It separates solid impurities such as dust, pollen, and abrasive particles from the air. 3. Absorbing moisture: It absorbs moisture, soot, ozone, odors, carbon oxides, SO2, CO2, etc., from the air, providing strong and long-lasting moisture absorption. 4. Ensuring driving safety: It prevents the car windows from fogging up, ensuring clear visibility for the driver, provides fresh air to the cabin, prevents passengers from inhaling harmful gases, and effectively kills bacteria and eliminates odors.