Cleenaire CAF2118 The First Class Cabin Filter for Mercedes CLS, E Class -With Double Sided Activated Carbon Seven Stage Patented Protection From Dust, Allergens And Harmful Gases- The Most Advanced Cabin Filtration On The Market Both Sides Of The Filter Are Equally Protected With Activated Coconut Shell Carbon - NO MORE Dreaded Airflow Arrow! Reinforced Framing Surrounding The Entire Perimeter Provides Unmatched Stability And Sealing To Prevent Contaminated Air Bypassing The Filter Deep Pleated Design For High Airflow (1200 mm/s) While Maintaining Superior Filtration This Filter Is Made For Those That Care About The Air They Breathe- Satisfaction Guaranteed Our filters use a DOUBLE SIDED ACTIVATED CARBON with a BI-DIRECTIONAL design to eliminate the DREADED airflow arrow and the guesswork that goes with it. REINFORCED FRAME STRUCTURE providing extra stability - allowing no room for contaminates to bypass the filter. Using a patented SEVEN stage filtration process, the overall contaminate capture rate is UNMATCHED by any filter currently on the market! NEW HIGH AIRFLOW DESIGN allowing air to flow at a high rate Harmful gases (Exhaust Fumes, Carbon Monoxide.. etc.) Chemicals Vapors Cigarette Smoke Allergies Particle Matter Endotoxin Bacteria Virus Volatile Organic Compounds .. And other contaminates that can be damaging to your health.