Hoover Type A HEPA Bag (4-Pack), AH10135 (4) Type A HEPA BAGS 2 Packs of 2 Filter made with HEPA media; HEPA media traps 99.97% of dirt, dust and pollens down to 0.3 microns, for cleaner air than standard or allergen media Filter made with HEPA media. HEPA media traps 99.97% of dirt, dust, and pollens down to 0.3 microns, for cleaner air than standard or allergen media.