Patent ID: 6019809
Filing Date: 2000-02-01
Classification: B01D,F02M

Abstract:
A filter construction comprising:(a) a first, most upstream, region of depth media having a percent solidity of no greater than about 2% and being constructed and arranged to remove at least about 60% by weight of particulates within the size range of about 1 microns to about 10 microns, carried by an airstream which passes into said filter construction during use;(b) a second region of depth media positioned downstream from said first region of depth media; said second region of depth media being constructed and arranged to entrap at least 60%, by weight, of any particulates within a size range of about 1 micron to about 10 micron, which pass through the first region of depth media during use; and,(c) an oiled pleated paper filter positioned downstream of said second region of depth media.