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The Hunter 30547 PermaLife 547 Air Purifier features a new contemporary design and a permanent air filter, so you never have to replace your filter again! The Perma-Life permanent cleanable filter effectively captures 99.5% of all airborne particles as small as 0.5 microns in size that pass through the filter (such as dust, smoke, pollen, pet dander, and other irritating allergens). An advanced activated carbon prefilter reduces cooking, tobacco and pet odors while also capturing larger dust particles, lint and pet hair from dirty air. A separately controlled ionizer distributes negative ions throughout the room to speed up the cleaning process while freshening the air. Effective design exhausts clean, purified air back into the room from the top of the unit to avoid disturbing settled particles. PermaLife Cleanable Filtration System is 99.5% effective at capturing particles as small as 0.5 microns that pass through the filter. CADR certified rating for rooms up to 21' x 23' (510 sq ft): 329 Smoke, 330 Dust, 330 Pollen Separate replaceable carbon prefilter for 30% better odor reduction (included). Digital controls and LCD display: Control cleaning level, programmable timer, ionizer function, and monitor filter life at the touch of a button. Filter clean/change reminders (PermaLife filter can be vacuumed clean every 4-6 months). Remote Control included for ultimate convenience. Easy to use Manual or Programmable Controls: Convenient digital controls can be programmed for up to 4 different cleaning settings per day, or operated manually. Interlock switch safety feature automatically shuts off unit if front grill is removed during operation. Ionizer with separate on/off control. 3-speed Hunter fan. Snap on front grill makes prefilter replacement fast, clean and easy. Energy Star rated. 5-Year limited warranty Replacements: 30901 prefilter (included) Carton Dimensions: 19 1/2" L x 13" W x 27 1/2" H