Patent ID: 6875249
Filing Date: 2005-04-05
Classification: B01D,Y10S

Abstract:
1. An air filter element for a motor vehicle having an air intake or induction system, the air filter element comprising sufficient capacity for filtering about 1 to about 10 5 cfm of air in an engine having an output of about 2 to about 500 horsepower; the air filter element further comprising a white filter media held within a cartridge, the white filter media, the media having an initial efficiency, under ASTM-1215-89 with mono-disperse 0.78 micron polystyrene latex particles at 20 ft/min velocity, of at least 20%, that rises to greater than 95% during its useful service life, the media comprising: (a) a filtration layer comprising a white layer of fine fiber comprising a web of fiber the fiber having a diameter of about 0.05 to about 1 microns, a basis weight of about 5·10 (b) the web of fine fiber formed on a filtration layer comprising a layer of a white filter media having an efficiency of at least 15% and a permeability of less than about 200 fpm; wherein the layer of fine fiber surface loads and accumulates a layer of particulate, the substrate accumulates substantially no particulate and the appearance of the accumulated layer compared to the white filter media indicates the useful service life of the filter media pack.