Cleenaire CAF12000 The Most Advanced Protection Against Bacteria Dust Viruses Allergens Gases Odors, Cabin Air Filter For Nissan Altima, Maxima, Quest, Murrano 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) Producing Only A Slight Restriction Over The Inferior OEM and Aftermarket Paper Thin Filters This Filter Is Made For Those That Care About The Air They And Their Passengers Breathe- Satisfaction Guaranteed