Bosch HEPA Premium Cabin Air Filters are designed and tested to meet High Efficiency Particulate Air (HEPA) standards based on ISO 29463-3:2011 and provide filtration efficiency of 99.97% at 0.3 microns This efficiency provides ultimate protection in trapping particulates that can enter your vehicle and provides the cleanest air possible for you and your family Melt-blown electrostatic layer and very dense media provide greater trapping capabilities; Additional static cotton layer added to the HEPA media provides higher capacity Structural ribs incorporated into design ensure filter integrity, increasing the stability of the filter for optimum performance over its lifetime Bosch HEPA Cabin Air Filters provide true clean air for enhanced respiratory health without an added chemical odor neutralizer; Cabin air filters should be replaced at least once every 12 months (or every 12K miles) Compatible with select vehicles (Note: vehicle trim level may affect fitment - verify specific vehicle fitment details with fit checker above): CADILLAC: 2002 Escalade, 2002 Escalade EXT; CHEVROLET: 2002 Avalanche 1500, 2002 Avalanche 2500 Compatible with (continued): CHEVROLET: 1999-02 Silverado 1500, 2001-02 Silverado 1500 HD, 1999-02 Silverado 2500, 2001-02 Silverado 2500 HD, 2001-02 Silverado 3500, 2000-02 Suburban 1500, 2000-02 Suburban 2500, 2000-02 Tahoe Compatible with (continued): GMC: 1999-02 Sierra 1500, 2001-02 Sierra 1500 HD, 1999-02 Sierra 2500, 2001-02 Sierra 2500 HD, 2001-02 Sierra 3500, 2000-02 Yukon, 2000-02 Yukon XL 1500, 2000-02 Yukon XL 2500