IQAir Replacement Pre-filter (H11S) for GC Series and Dental Series Air Purifiers - 102 10 12 00. Micro- and Nano-particle Filtration (HEPA) eliminates micro- and nano-particles such as allergens, smoke, bacteria and viruses. This thorough particle pre-filtration is essential for extending the life of the gas phase control media by preventing its pores from clogging with particulates.