... in thundering generator ozone and negative ion. This model makes use of this principle, with air as the material and the aid ... in thundering generator ozone and negative ion. This model make use of this principle, with air as the materialand the aid ... .9% of dust particles, tiny hairs, mites, etc.; minimum cleaning particles 0.0001MM.4. Activated carbon filter, in formaldehyde, benzene, nitrogen and ...