This Honeywell Air Genius 5 Air Purifier features 5 levels of cleaning power and patented ifD technology to capture up to 99.9% of microscopic airborne particles*1 ( 1 From the air that passes through the filter, 0.3 microns and larger. 2 Based on 3rd party independent CADR testing for the smoke CADR value when operated at the highest level. Air circulation depends on many factors, such as room size and configuration. There is no guarantee that all of the air in a room will pass through the filter. 3 The ifD particle filter and foam pre-filer can be washed to clean. 4 When operated with the odor reducing pre-filter. It is recommended that the pre-filter be replaced every 3 months to effectively reduce common household odors and VOCs in a room).