Honeywell HPA300C True HEPA Air Purifier for Extra Large Room, Allergen Remover uses HEPA Filter & Activated Carbon Pre-Filter, Captures 99.97% of Airborne Particles & Up to 99% Viruses. We have 2 units that are just over 1 year old and are in excellent working condition, $120 each. Uses 3 type “R” HEPA replacement filters and one type “A” pre-filter.