PUR exclusive enhanced HVAC filters up to 99.7% of dust, pollen and contaminants, PUR exclusive activated carbon weaves are USA-engineered to last up to 15,000 miles, 25% longer than standard performance of 12,000 miles, PUR filter use thick, industrial strength electrostatic media to trap even the tiniest of particles while densely packed activated carbon prevents gases and odours from entering the cabin, Road debris, exhaust fumes, and contaminants undergo filtration through a three-layer system, which includes a dust filter for trapping road debris, a particle-averting filter to block airborne particles, and an adsorption filter for absorbing exhaus, Contains soda combined with carbon cleans the outside air flowing through the ventilation system, Part Reference Numbers : 90233C XC45844C CF10934 CF1217 AFC1569 PC5844 C45844C 49357, Kit Includes: 4x Cabin Air Filter, Kit Variations: K54-100117 K54-100258 K54-100473 K54-100565 K54-100750 K54-100909 K54-101068 K54-101227 K54-101386 K54-101545, Part Reference Numbers : 90233C XC45844C CF10934 CF1217 AFC1569 PC5844 C45844C 49357