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13 guides.
The 75i is Alen's large-room machine, built for open plan spaces up to about 540 sq ft at allergy-level air changes. It is quiet and efficient, but its CADR is Alen's own and it costs more than certified rivals.
Basements are damp, dusty and often open plan. A basement purifier needs real carbon for the musty smell and enough certified CADR for a big room, and it works best alongside a dehumidifier.
For a room over 400 sq ft, only a purifier with more than about 300 cfm of certified smoke CADR keeps up. These five do, and one big Coway that is not AHAM listed.
No single portable cleans a whole house. You either spread certified purifiers through the rooms you use, upgrade the furnace filter, or both. Here is how the options compare.
The 211i Max replaced the Blue Pure 211+, and it is one of the strongest purifiers AHAM lists at this price: 435 cfm of smoke CADR, very low power draw, and a choice of four filters.
Blueair's Classic 605 was a big steel box for large rooms. It is gone from AHAM's directory and from Amazon as a new unit. Here is what owners and shoppers should do instead.
The Airmega 400 is Coway's large-room machine: two filter sets drawing air from both sides, a smart mode that reads particles and light, and a five-year warranty. It is also expensive.
The HPA300 is the plain-box classic: lots of certified airflow for the price, simple buttons, no app and no sensor. Its catch is filter upkeep: three HEPA filters and four pre-filters a year.
IQAir's HealthPro Plus is the purifier hospitals and the cautious buy: heavy, well sealed, with a gas filter and a HEPA stage that lasts four years. IQAir also refuses to publish a CADR, which makes it hard to compare.
Molekule's Air Pro pairs a HEPA layer with PECO, a photo-electrochemical stage Molekule says destroys pollutants. Ad regulators trimmed its claims, it publishes no CADR, and its filters cost about $350 a year.
Shark's six-fan Air Purifier 6 was a big, powerful tower. You can still buy its filters from Shark, but not a new unit on Amazon. Here is what owners and shoppers should know.
Six air purifiers that earn their place on certified numbers: the right CADR for the room, sensible filter costs, and no marketing-only claims.
The EVDC500 is an evaporative humidifier, so no white dust, with two 1-gallon tanks and a frugal DC motor. It suits a living room or open-plan space better than a nightstand.
