Fitting not included. The combi filter provides long-lasting protection against the harmful particles – and so much more. With an activated carbon layer, it also adsorbs odours and various gases, such as benzene or ozone. In addition to the small solid particles, gases that are up to ten million times smaller enter into the deep regions of the lungs. For example, the dangerous irritant ozone can cause reactions such as headache, throat irritation and watery eyes. The activated carbon layer of the combi cabin air filter removes up to 99 percent of the ozone. Needs to be replaced every year.