Used in automobile For particle fitration&ploouted air filtration Auot Air Filter ( cabin air filter , car air filter ) Single-effected/double effected automobile air filter: Single-effected(white color):particle filtration Double-effected (mixed color of black & white): Particle Filtration & Polluted air filtration Static nonwoven filter core (single-effected) / Activated carbon nonwoven compounded filter core(double-effected). Enhanced polypropylene plastic frame Filter core and plastic frame are fixed by plastic injection molding directly with compact configuration. Single-effected filter can eliminate the inhalable particulate matter from outside such as the pollen/particle/microbe, etc effectively to purify the air inside the automobile. Double-effected filter can eliminate the inhalable particulate matter from outside such as the pollen/particle/microbe, etc, but also can get rid of the smog smell /toluene/sulfur dioxide such harmful gas effectively to purify the air inside the automobile.