Cleenaire CAF667 The Most Advanced Protection Against Bacteria Dust Viruses Allergens Gases Odors, Cabin Air Filter For Audi 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 Please Read Product Description Regarding Fitment, This Filter Is Made For Those That Care About The Air They And Their Passengers Breathe- Satisfaction Guaranteed Our filters use a DOUBLE SIDED ACTIVATED CARBON with a BI-DIRECTIONAL design to elimanate 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 filteration 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.. ect) Chemicals Vapors Cigarette Smoke Allergies Particle Matter Endotoxin Bacteria Virus Volatile Organic Compounds .. and hundreds of other contaminates that can be damaging to your health.