POTAUTO MAP 1017C (CF10612) Activated Carbon Car Cabin Air Filter Replacement for SMART, Fortwo Spec.: 8.43" (Length), 8.43" (Width), 0.94" (Height); Four-layer fabric (One Carbon Layer) ; Installation instructions included. Applications Where Used: SMART (Fortwo 16-08) (See Amazon Part Finder for fitments to your cars) Benefits: (1) Reducing at least 98% of these contaminants (Dust, Pollen, Exhaust Gas, Particles of 5-100 microns...etc.) from the air passing through the filter & entering the interior of the vehicle. (2) Activated carbon cabin filter provide extra protection by absorbingthe airborne agents & allergens. (3) Increase safety through reduced deposits in the fan or on the windscreen, and protect HVAC air conditioning performance Competitor Cross Reference Part Numbers (for reference only, please check size): HENGST E2946LC, MANN & HUMMEL CUK2132, MERCEDES-BENZ 451 830 0018, NAPA 9351, Ecogard XC35843C,ATP RA-88, WIX 49351, FRAM CF10612 *** Change filter every 12 months or 12, 000-15, 000 miles. Check & replace filter if peculiar smell / odors emit from the cabin air outlets, or if the vehicle HVAC system operates with poor performance, or humming, or weak air volume. ***LEGAL DISCLAIMER: The Brand name & Model # (if listed) are for cross reference only. All Brands, Trademarks & Model Numbers remain the property of their respective owners.