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Hi, HEPA (High Efficiency Particle Arrestors) filter out stuff down to 0.3 microns. I found the following site very useful. Kind regards, James ******************************** Please remove this footer before replying. OCC-HEALTH ARCHIVES: http://www.jiscmail.ac.uk/lists/occ-health.html CONFERENCES AND STUDY DAYS: http://www.jiscmail.ac.uk/cgi-bin/filearea.cgi?LMGT1=OCC-HEALTH