Cabin filters are pleated particulate filters installed within a vehicle’s HVAC system, typically behind the glove compartment or under the dashboard. They remove dust, pollen, debris, and odors from air entering the passenger compartment, improving air quality. Filter media utilizes materials like paper, charcoal, or synthetic fibers, with varying MERV ratings to denote filtration efficiency. Some filters incorporate antimicrobial treatments to inhibit mold and bacterial growth. Replacement is recommended at specified intervals to maintain HVAC performance and air quality, varying by vehicle and driving conditions.