The Therapure TPP250s HEPA type technology removes allergens, pollution, smoke and odors. The UV germicidal light kills airborne germs and bacteria, and the photocatalyst filter removes harmful fumes and chemicals. CADR (clean air delivery rate): Smoke 167 - Dust 170 - Pollen 184. 3 speed fan settings, UV light indicator, ionizer with on/off button, 24 hour automatic timer, easy to clean, no filters to replace. For large size rooms. Energy Star certified.