When road users travel along with the road network, the air circulating in their passenger compartment is renewed thanks to air conditioning and ventilation systems, which allow outside air to enter the automobile. But to preserve the health and comfort of drivers, the filter must purify this outside air. To fulfil this mission, parts such as cabin filters are installed in vehicles, which help retain impurities and germs outside the car cabin.


  • The cabin filter in motor vehicles: what is it?
  • What are the functions of the cabin filter?
  • Why do you have to change your cabin filter regularly?

The cabin filter in motor vehicles: what is it?

The cabin filter is integrated into vehicles and intended to rid the outside air of certain particles before it is injected into the passenger compartment through the ventilation or air conditioning circuit if the car has one. Team.

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What are the functions of the cabin filter?

As its name suggests, the car’s cabin filter will have to filter all particles carried in the air that could clog the cabin or interfere with the driver’s concentration. Thus, the main task of this air filter is to filter:

  • the various allergenic (pollen, dust) and pathogenic (microbes, viruses) particles suspended in the air
  • the exhaust gas from other vehicles
  • the other pollutant particles, including related works or industrial activities likely to be found near roads

Composition of cabin filters

You can install different filters in the passenger compartment air vents, such as:

  • the single pollen filters intended to block only large particles, including pollen
  • the activated carbon filters (or activated carbon), which in addition to a filter material also comprises a layer of activated carbon, a known method for effectively filter different types of gas, also blocking their bad smell
  • the filters polyphenol, a substance found in some plants and effectively filter allergens and bacteria while avoiding their proliferation in the passenger compartment

By choosing a specific type of cabin filter over another, motorists will be able to define which kinds of particles they wish to protect themselves from after activating their air conditioning. This possibility of changing the type of filter is generally very popular with users subject to specific allergies, whether to dust or pollen, for example.

Why do you have to change your cabin filter regularly?

Like all filters integrated with motor vehicles, cabin filters become clogged as they move around the car, which will have the effect of preventing the proper circulation of outside air inside. of the passenger compartment. This fouling can go as far as the complete blockage of the filter, which could impact, in particular, the motor of the ventilation system. The engine may then suffer damage requiring the replacement of this device. It is therefore advisable to regularly change the cabin filter of the vehicle according to your driving habits.

Road users who are more used to travelling in built-up areas must change the filter every 15,000 km (or every two years) for users travelling mainly in rural areas, and every 10,000 km (or every year) for vehicles used more for driving built-up areas. However, the best way to know when it becomes necessary to change your cabin filter is to conduct a visual examination. For this, the driver can find the filter behind the glove box. But suppose the driver is not used to unscrewing the components associated with the glove box, which requires some meticulousness. In that case, the driver is advised to drive his vehicle to a garage to have this check carried out by a professional. If the filter is visually too dirty, then the user will have to change it.