Engines love clean air, but it can't always be found in road traffic. And for a mileage of 1-2 million km, clean combustion air becomes a pure necessity. The permitted quantity of dust which can pass through commercial-vehicle engines is around half the quantity for cars. Bosch air filters therefore have a very fine-pored filter medium, whose filtration efficiency and pressure reduction are precisely adjusted to each other. Fresh air for construction site vehicles: Here it is also recommended to use additional air filters, e.g. secondary filter inserts and cyclone separators.