A bi/multi-directional air flow filter cartridge includes a filter pad and a filter pad base. The filter pad includes: outer filter walls made of a filter material suitable for filtering at least particulates, the walls being spaced apart to define an inner area therebetween, and to allow air to pass...http://www.google.es/patents/US6761169?utm_source=gb-gplus-sharePatente US6761169 - Bi/multi-directional filter cartridge and filter platform for mounting the cartridge thereon
Bi/multi-directional filter cartridge and filter platform for mounting the ...
