Regularly changing the cabin filter is necessary to ensure permanent functionality of the air conditioning system. The rule of thumb is at least once a year, and many drivers change them twice a year. This not only protects the air quality in the vehicle, but also reduces flow resistance and thus the load on the fan motor. Hengst cabin filters filter approximately 100 percent of pollen, dust, other allergens, and odors such as exhaust gases out of the air. This ensures a hygienic atmosphere in the vehicle and helps the driver remain alert and concentrated.