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14 guides.
An office purifier runs eight to ten hours a day while you work beside it. It needs enough certified airflow for the room, a fan you can talk over and filters that do not need weekly attention.
A smart purifier earns its Wi-Fi chip with a good sensor and an auto mode you can trust. These certified picks do; we also say which sensor each uses and what it misses.
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.
The 411i Max is Blueair's small-room purifier: about the airflow of a Levoit Core 300, a quieter low setting, a particle sensor and app, and power draw lower than most lamps on its lowest speed.
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.
Dyson's Purifier Cool PC1 replaces the TP07 in Dyson's US range. It is a well-built fan with a sealed HEPA filter, but Dyson publishes no CADR, so you pay a premium without a certified number.
The HP1 is Dyson's current heater, fan and purifier, sold in place of the HP07. It earns its price only if you will use all three jobs; as a purifier alone, certified machines do more for less.
The Core 400S-P is the Core 300's bigger, smarter sibling: a laser particle sensor, auto mode and an app, with enough certified airflow for a living room up to about 360 sq ft.
The Vital 200S-P is Levoit's pet-household purifier: the most certified airflow in Levoit's mid-range, a side inlet that keeps fur off the filter, and a rectangular body that fits against a wall.
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.
The MinusA2 is the purifier you can hang on a wall. It is quiet, slim and lets you pick a filter for pets, odors or toxins. Its smoke CADR is Rabbit Air's own and smaller than its price suggests.
Smart features can make a purifier work harder when it matters and quieter when it does not. Others just add an app. Here is how to tell the difference before you pay extra.
The one widely sold smart filter, Filtrete's Bluetooth model, tracks filter life from airflow and run time. For everyone else, a dated frame and an app reminder do most of the job.
The AM90 is Winix's taller Wi-Fi tower. Its certified airflow matches the 5510, but its carbon filter needs replacing four times as often, and Amazon has had it out of stock.
