Much more importantly, the AirDoctor AD3500 has every thing you might need to overcome airborne allergens: a pre-filter that traps massive particles like dust and hair, a twin-motion carbon/VOC filter that absorbs odors and damaging gaseous compounds, and an UltraHEPA filter able to trapping 99. Purchased 200 rounds of bulk https://pauld715ueo0.wikicarrier.com/user