Coway Airmega 400
230 CFM (smoke)
cadr rating
1,560 sq ft
room coverage
True HEPA + activated carbon
filter type
22–52 dB
noise level
14.8 x 14.8 x 22.8 in
dimensions
$450
price
Blueair Blue Pure 311i+ Max
250 CFM (smoke)
cadr rating
1,516 sq ft
room coverage
HEPASilent (electrostatic + mechanical)
filter type
22–53 dB
noise level
11.8 x 11.8 x 24 in
dimensions
$300
price
Dyson Purifier Big+Quiet Formaldehyde
327 CFM
cadr rating
Up to 1,076 sq ft
room coverage
HEPA H13 + catalytic oxidation
filter type
37–56 dB
noise level
17.6 x 17.6 x 41.3 in
dimensions
$800
price
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