Purolator® Cabin Air Filters capture up to 96.5% of pollen, dirt and dust, soot, inert allergens and other fine dust particles. Improves HVAC and defroster performance. Meets OE performance requirements. Replace annually for fresher, cleaner air in your car. Up to 96.5% Dirt Removal Power. Blocks inert allergens and fine dust particles. Improves HVAC and defroster performance. Meets OE performance requirements. Replace annually for fresher, cleaner air in your car