The Therapure TPP240’s 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 137 - Dust 132 - Pollen 155. 3 speed fan settings, UV light indicator, ionizer with on/off button, 24 hour automatic timer, easy to clean, no filters to replace. For medium size rooms. Energy Star certified.