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Best air purifier overall
Pros: Good for large rooms, does not emit ozone, endorsed by medical groups.
Cons: High price, loud at highest setting.
not avail.N/AIQAirN/AHyperHEPA with pre-filter260YesSix1,00015 in16 in28 in29 poundsFive yearsPre-filter *est. $60 every six- eighteen months; HEPA filter *est. $190 every two-four years -
Best valuePros: Performs well in tests, can be wall-mounted, replacement filters relatively inexpensive, lifetime warranty.Cons: Some complaints of "humming" power supply, expensive, meant only for small rooms.893127001056AlenA350-WTrue HEPA with carbon filter and pre-filter250YesFour80017.48 in8.23 in18.5 in16 poundsLifetimeCombined HEPA, carbon filter and pre-filter, *est. $40 -- replace every six to nine months
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Air cleaner for very small roomsPros: Permanent HEPA filter, low price.Cons: Small coverage area (maximum of 375 feet), noisy, "Permanent" filter has to be replaced eventually.090271502501Honeywell50250Permanent HEPA with carbon pre-filter250YesThree37517.75 in19 in17.75 in20 poundsFive yearsVacuum permanent HEPA filter twice yearly and replace when degraded; pre-filter *est. $20 every three months
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Furnace filterPros: Treats whole house, good for capturing dust and pet dander, inexpensive.Cons: Won't help much with smoke or odors, can affect airflow.
not avail.0511110200053MN/ATreated, pleated paperDepends on forced-air systemNo (but you can register on 3M's website for e-mail reminders)N/AWhole-house18 in9 in27 inN/ANoneReplace furnace filter every three months
