MicronAir Particle Cabin Air Filter, fits Nissan Frontier 2005-2013 requires 2 filters, Pathfinder 2005-2009 requires 2 filters, Xterra 2005-2013 requires 2 filter. Traps Harmful pollutants before they reach your vehicle's interior and provides cleaner air for allergy and asthma sufferers. Vehicle manufacturer recommends filter be changed every 6 to 12 months.