Automobile Engineering in ME
The main purpose of an engine's air cleaner is that it

Reduces the engine's air intake noise
Controls the engine's air intake volume
Prevents dust and other foreign matter from entering the engine
Prevents rain water from entering the engine

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Automobile Engineering in ME
In a ventilated disc brake

A duct directs air towards the caliper for cooling while the vehicle is moving
Caliper is covered with cooling fins
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance
Disc contains many small holes for optimum cooling performance

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