Detailed Product Description Model#HMA-300/RH5 Stages of air purification system1. Negative ion2. UV light, long lasting, at least 20000 hours3. Tio2 photo-catalytic filter4. True washable HEPA filter, 99.97% efficiency.5. Ozone generator: optional, if you don't need it, just take out ozone plate.Application Area: 3500 squre feetApplications: Remove dust, small particles, pollen, kill bacterial ...