****Note: Vehicles listed below were NOT factory equipped with a Cabin Air Filter - filter only fits vehicles with dealer Installed Cabin Air Filter retrofit kit - verify presence of filter in vehicle before filter purchase. Bosch HEPA Cabin Air Filters provide your vehicle with the ultimate in clean, fresh, odor-free air for you and your family. Without adding formulated chemical odor neutralizer, Bosch HEPA Cabin Air Filters provide true clean air to enhance respiratory health. Melt-blown electrostatic layer and very dense media provides greater trapping ability. An additional static cotton layer added to HEPA media provides higher capacity filtration capabilities. Structural ribs incorporated into design provide increased structural stability of the filter, ensuring it retains its shape and flow characteristics. Designed to meet High Efficiency Particulate Air (HEPA) standards based on standard ASTM D2986, Bosch Cabin Air Filters provide filtration efficiency of 99. 97% at 0. 3 microns. Compatible with the listed vehicles only if equipped with dealer installed Cabin Air Filter retrofit kit: FORD: 1997-03 Expedition, 1997 F Super Duty, 1997-04 F-150, 2004 F-150 Heritage, 1997-99 F-250, 1999-03 F-250 Super Duty, 1997 F-350, 1999-03 F-350, 1999-03 F-350, 1999-03 F-450, 1999-03 F-550; LINCOLN: 2002 Blackwood, 1998-04 Navigator.