Patent ID: 6015452
Filing Date: 2000-01-18
Classification: B01D,F02M

Abstract:
A method of servicing an air cleaner of a vehicle having an engine size of at least 1.2 liters; said method including a step of:(a) installing, in the housing of an air cleaner of a vehicle having an engine size of at least 1.2 liters, a filter arrangement comprising:(i) an inner air filter including:(A) first and second end caps;(B) an outer liner extending between the first and second end caps; said outer liner having a first open surface area;(C) a cylindrical extension of pleated filter media circumscribed by said outer liner and extending between said first and second end caps;(D) said inner filter being circular and having: an inside diameter within the range of 4 inches to 14 inches; and, an outside diameter within the range of 5 inches to 25 inches; and,(ii) a removable and replaceable prefilter circumscribing said inner filter and covering at least 90% of said first open surface area of said outer liner;(A) said removable and replaceable prefilter comprising a ring construction of filter material including at least first and second layers of filter media secured together;(1) said first layer generally circumscribing said second layer;(2) said first layer comprising nonwoven fibrous depth media having an average fiber diameter of no greater than 40 microns; and(3) said second layer comprising a layer of foam media including an open cell foam having a cell density of 30 to 80 pores per inch.