Trane CleanEffects utilizes patented, breakthrough air cleaning technology to remove up to an astounding 99.98% of airborne allergens from the air that passes through the filter, making it 8 times more effective than even the best HEPA room filters and up to 100 times more effective than a standard 1" filter. What's more, Trane CleanEffects has been performance-tested by LMS Technologies and Environmental Health &Engineering, Inc. (EH&E), with the results verified by professors from the Harvard School of Public Health, so you know you're getting an air filtration system like no other.