function of air filter:

1. Filters are used to remove foreign particles like dirt, dust and grit or filters are used to remove dust and particles out of the air.

2. It may also remove odors and gaseous pollutants.

3. It acts as a silencer for the carburation system.

4. In case the engine backfires, the air filter also acts as a flame arrester.

As hundreds of cubic meters of air per hour is used by the engine of an automobile, it is very important that this air should be very clean. Impurities like dust in the air cause a very rapid wear if the engine, particularly of the cylinders, pistons, rings, valves and guides. Further if the dirty air enters the crankcase, it will contaminate the lubricant oil and ultimately damage the bearings and journals and decrease the service period of the lubrication system. It is therefore customary to install air filter on the intake system of automobile engines.