CPAP Supply USA Community

John, The respironics ultrafine filter holds back anything over 0.3µ ( microns), HEPA quality, but not HEPA tested. The sizes of typical contaminates are: Lint 10µ Pollens 10µ to 100µ Household Dust 0.3µ to 5µ Human Skin Cell 3 µ to 15 µ Atmospheric Dust 0.001µ to 15µ Tobacco Smoke 0.01µ to 1µ Bacteria...