Best Car Air Filter - Its Functions and Maintenance A car cabin air filter is a very important component of your vehicle. It is a filtration device attached to the air intake of car's ventilation system. The main function of this device is to improve the quality of air penetrating inside your car as well as of the air already present inside the car. Although most of the filters are made using pleated paper system, a host of other filtration media is also present. An intelligent blend of paper and cotton is perfect for the filter. However, other models using miniature paper filters are also available. This filter is totally different from the internal combustion filter that sits under the hood of the car and prevents the dust from getting into the car's engine to facilitate smooth functioning. Distinction between the two is very clear and having its knowledge is very important. Both of them hold an important place in your car's smooth functioning and hence you must