Honeywell 17000-S Quietcare True HEPA Air Purifier:/b> * The True HEPA filter captures up to 99.97% of common household particles as small as 0.3 microns from the air passing through it such as dust, pollen, tobacco smokee and dander * Helps reduce viruses and bacteria * Carbon pre-filter captures larger airborne particles and helps remove common household odors * HEPA filter is easy to maintain and can be vacuumed to extend its life * Intelli-Check Electronic Filter Indicator reminds you when to check the HEPA filter and when to replace the carbon pre-filter * Recommended for rooms up to 200 sq ft * Electronic push button controls, 3 cleaning levels * SurroundSeal Technology helps minimize air leaks to ensure that the air passes through the filter,capturing particles as small as 0.3 microns * Replacement Pre-filter: HRF-AP1 or 38002