Patent ID: 6165572
Filing Date: 2000-12-26
Classification: B01D,B32B,D04H,Y10S,Y10T

Abstract:
An air filter construction comprising:(a) a first filter media arrangement having a configuration of one of pleated and corrugated, the media arrangement comprising a multi-layer composite and including at least first, second, and third layers of fine fibers therein;(i) said first layer of fine fibers comprising a most upstream layer of said first, second, and third layers of fine fibers;(A) said first layer of fine fibers having an average fiber diameter of no greater than about 5 microns;(B) said first layer of fine fibers having a first efficiency for filtering, on its own, of no greater than 32.6%;(ii) said second layer of fine fibers being downstream of said first layer of fine fibers;(A) said second layer of fine fibers having an average fiber diameter of no greater than about 5 microns;(B) said second layer of fine fibers being spaced from said first layer of fine fibers by a distance no greater than about 254 microns;(C) said second layer of fine fibers having a second efficiency for filtering, on its own, of no greater than 32.6%;(iii) said third layer of fine fibers being downstream of both of said first layer of fine fibers and said second layer of fine fibers;(A) said third layer of fine fibers having an average fiber diameter of no greater than about 5 microns;(B) said third layer of fine fibers being spaced from said second layer of fine fibers by a distance no greater than about 254 microns;(C) said third layer of fine fibers having a third efficiency for filtering, on its own, that is greater than said second efficiency for filtering and that is no greater than 68.8%.