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6 guides.
The 45i is Alen's mid-size purifier: a strong claimed CADR, a choice of filters for different problems, and a lifetime warranty that only lasts as long as your filter subscription.
Under $200 you can buy a purifier certified for a 390 sq ft living room. The trick is to compare certified airflow and filter cost, not the coverage number on the box.
The Mighty has been the reference mid-size purifier for a decade. It is still cheap to run, but it is no longer in AHAM's directory, it carries an ionizer, and Coway has a successor.
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 MA-40 is AHAM listed with real airflow for its price and a lifetime warranty. Its weak points are a short filter interval, which makes running costs climb, and louder low settings than the best rivals.
A purifier's certified CADR is only reached if air can get in and out. Placement decides how much of that clean air reaches you. Here are the rules, in order of how much they matter.
