A filter assembly is disclosed which has a first filter element held by or bonded to a spacer and a second filter element positioned adjacent the spacer on a side of the spacer opposite the first filter....http://www.google.es/patents/US6093230?utm_source=gb-gplus-sharePatente US6093230 - Filter assembly comprising two filter elements separated by a hydrophobic foam
Filter assembly comprising two filter elements separated by a hydrophobic foam
