Best Large-Room Air Purifiers: Coway, Blueair, Levoit, Winix, IQAir & More (2026)

For a living room, open-plan floor or basement, the number that matters most is CADR (clean air delivery rate): how many cubic feet of filtered air a purifier delivers per minute. AHAM's rule of thumb is that the smoke CADR should be at least two-thirds of the room's floor area, so a 450 sq ft room wants about 300 CFM. Here are 20 large-room purifiers from Coway, Blueair, Levoit, Winix, Rabbit Air, IQAir, Shark, Honeywell and Molekule, ranked on what their makers publish.

Updated 2026-11-1220 products compared6 scored criteriaHow this ranking works

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Top pick

Coway Airmega ProX

Score 8.3/10 · Check price

Why it wins: The most clean air of any purifier here. 568 CFM smoke CADR. Quietest top speed listed here (46 dB).

Also great: Blueair Blue Signature (7.3) · Winix XQ (6.0)

8.3/10

Check price at Amazon See pros, cons & specs

Side-by-side comparison

Swipe sideways on mobile. Green marks the best figure in each column.

Product	Score	Smoke CADR	CADR per watt	Main filter life	Quietest setting	Best for	Price	Buy
1 C Coway Airmega ProX	8.3/10	568 CFM	8.7 CFM/W	12 months	23 dB	The most clean air of any purifier here	Check price	View deal
2 B Blueair Blue Signature	7.3/10	455 CFM	10.8 CFM/W	12 months	23 dB	455 CFM from a 13.2 lb side-outlet unit	Check price	View deal
3 W Winix XQ	6.0/10	461 CFM	Not listed	12 months	27 dB	Winix's dual-filter large-room model, 461 CFM smoke	Check price	View deal
4 B Blueair Blue Signature SP3i	5.7/10	321 CFM	8.9 CFM/W	12 months	19 dB	The mid-size Signature, 321 CFM	Check price	View deal
5 B Blueair Classic Pro CP7i	5.7/10	393 CFM	6.8 CFM/W	12 months	24 dB	A two-filter, 393 CFM unit	Check price	View deal
6 B Blueair Blue Pure 311i+ Max	5.6/10	339 CFM	8.9 CFM/W	9 months	23 dB	339 CFM at 7.9 lb	Check price	View deal
7 C Coway Airmega 400S	4.8/10	328 CFM	5 CFM/W	12 months	22 dB	Coway's large-room classic with app control	Check price	View deal
8 RA Rabbit Air A3	4.8/10	257 CFM	Not listed	24 months	20.3 dB	A wall-mountable purifier with a custom filter slot	Check price	View deal
9 C Coway Airmega 300	4.2/10	285 CFM	5 CFM/W	12 months	22 dB	The 400's smaller sibling, without an app	Check price	View deal
10 L Levoit Core 400S	3.8/10	231 CFM	6.1 CFM/W	Not listed	22 dB	A cylinder purifier with 231 CFM at 38 W	Check price	View deal
11 L Levoit EverestAir	3.8/10	354 CFM	5.1 CFM/W	Not listed	24 dB	Levoit's 354 CFM purifier with adjustable vents	Check price	View deal
12 L Levoit Vital 200S	3.6/10	250 CFM	5 CFM/W	Not listed	23 dB	A 250 CFM purifier with a pet mode	Check price	View deal
13 W Winix AT40	3.5/10	265 CFM	Not listed	12 months	22.04 dB	An Energy Star 265 CFM purifier	Check price	View deal
14 W Winix T810	3.5/10	272 CFM	Not listed	12 months	23.8 dB	A 272 CFM tower with a numeric air display	Check price	View deal
15 S Shark BreatheClear MAX (HP362)	3.5/10	Not listed	Not listed	72 months	Not listed	Shark's biggest purifier, with up to 6 years before a filter change	Check price	View deal
16 C Coway Airmega 250S	3.4/10	249 CFM	3.9 CFM/W	12 months	22 dB	A slim, wall-friendly 249 CFM purifier	Check price	View deal
17 S Shark NeverChange Air Purifier MAX (HP302)	2.3/10	Not listed	Not listed	60 months	Not listed	A 5-year-filter purifier for up to 1,400 sq ft	Check price	View deal
18 I IQAir Atem X	2.1/10	Not listed	Not listed	Not listed	15 dB	IQAir's large round purifier, 15 dB on low	Check price	View deal
19 H Honeywell InSight HPA5300	2.1/10	Not listed	Not listed	Not listed	Not listed	Three HEPA filters for a 500 sq ft room	Check price	View deal
20 M Molekule PECOAir+	2.0/10	Not listed	Not listed	6 months	32 dB	PECO + HEPA filtration with CO2 and TVOC sensors	Check price	View deal

"Not listed" means the manufacturer page we used does not publish that figure. Prices show "Check price" until a retailer feed provides a current price.

Every large-room air purifier, ranked

#1 · Top pick

Coway Airmega ProX

Best for: The most clean air of any purifier here

8.3/10

What we like

568 CFM smoke CADR
Quietest top speed listed here (46 dB)
8.7 CFM per watt

Watch out for

51 lb and 36.6 in tall

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	568 CFM
CADR per watt	8.7 CFM/W
Quietest setting	23 dB
Loudest setting	46 dB
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (smoke / dust / pollen)	568 / 580 / 450
Coverage	4,253 ft² at 1 air change/hr; 2,126 ft² at 2
Filter	Washable pre-filter + Max2 (activated carbon + HEPA)
Filter life	Max2: 1 year
Noise	23–46 dB(A)
Power	65 W
Sensor	PM1, PM2.5, PM10
Weight	51 lb
Price	Check price

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Specs source:

Coway: Airmega ProX

Blueair Blue Signature

Best for: 455 CFM from a 13.2 lb side-outlet unit

7.3/10

What we like

10.8 CFM per watt, the best here
455 CFM at 13.2 lb

Watch out for

55 dB at top speed

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	455 CFM
CADR per watt	10.8 CFM/W
Quietest setting	23 dB
Loudest setting	55 dB
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (smoke / dust / pollen)	455 / 434 / 450
Recommended room	705 ft² (4.8 ACH)
Filter	Particle + carbon
Filter life	Up to 1 year (RealTrack)
Noise	23–55 dB
Power	3.5–42 W
Weight	13.2 lb
Price	Check price

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Specs source:

Blueair: Blue Signature

Winix XQ

Best for: Winix's dual-filter large-room model, 461 CFM smoke

6.0/10

What we like

461 CFM smoke CADR
Carbon and HEPA both rated 12 months

Watch out for

Power and top-speed noise not listed
30.86 lb

Score breakdown

Smoke CADR 44%

CADR per watt * 17%

Quietest setting 11%

Carbon or odor stage included 11%

Main filter life 17%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	461 CFM
CADR per watt	Not listed
Quietest setting	27 dB
Loudest setting	Not listed
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (dust / pollen / smoke)	482 / >450 / 461
AHAM room size	714 ft²
Maximum coverage	3,427 ft² (1 ACH)
Filter	Dual 4-stage: True HEPA + CD carbon
Filter life	HEPA 12 months; carbon 12 months
Minimum noise	27 dB
Weight	30.86 lb
Price	Check price

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Specs source:

Winix: XQ

Blueair Blue Signature SP3i

Best for: The mid-size Signature, 321 CFM

5.7/10

What we like

19 dB on low
8.9 CFM per watt

Watch out for

54 dB at top speed

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	321 CFM
CADR per watt	8.9 CFM/W
Quietest setting	19 dB
Loudest setting	54 dB
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (smoke / dust / pollen)	321 / 309 / 330
Recommended room	498 ft² (4.8 ACH)
Filter	Particle + carbon
Filter life	Up to 1 year (RealTrack)
Noise	19–54 dB
Power	36 W
Weight	9.5 lb
Price	Check price

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Specs source:

Blueair: Blue Signature SP3i

Blueair Classic Pro CP7i

Best for: A two-filter, 393 CFM unit

5.7/10

What we like

393 CFM
Two filters

Watch out for

32 lb

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	393 CFM
CADR per watt	6.8 CFM/W
Quietest setting	24 dB
Loudest setting	55 dB
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (smoke / dust / pollen)	393 / 387 / 441
Recommended room	609 ft² (4.8 ACH)
Filters	2 × particle + carbon
Filter life	Up to 1 year (RealTrack)
Noise	24–55 dB
Power	2.6–58 W
Weight	32 lb
Price	Check price

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Specs source:

Blueair: Classic Pro CP7i

Blueair Blue Pure 311i+ Max

Best for: 339 CFM at 7.9 lb

5.6/10

What we like

Light at 7.9 lb
8.9 CFM per watt

Watch out for

9-month filter life

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	339 CFM
CADR per watt	8.9 CFM/W
Quietest setting	23 dB
Loudest setting	50 dB
Carbon or odor stage included	Yes
Main filter life	9 months
CADR (smoke / dust / pollen)	339 / 370 / 446
Recommended room	525 ft² (4.8 ACH)
Filter	Particle + carbon
Filter life	Up to 9 months (RealTrack)
Noise	23–50 dB
Power	38 W
Weight	7.9 lb
Price	Check price

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Specs source:

Blueair: Blue Pure 311i+ Max

Coway Airmega 400S

Best for: Coway's large-room classic with app control

4.8/10

What we like

328 CFM smoke CADR
App with scheduling

Watch out for

24.7 lb

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	328 CFM
CADR per watt	5 CFM/W
Quietest setting	22 dB
Loudest setting	52 dB
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (smoke / dust / pollen)	328 / 328 / 400
Coverage	3,120 ft² at 1 air change/hr; 1,560 ft² at 2
Filter	Washable pre-filter + Max2 set (activated carbon + HEPA)
Filter life	Max2: 1 year
Noise	22–52 dB(A)
Power	66 W
App	IoCare+ app, scheduler
Weight	24.7 lb
Price	Check price

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Specs source:

Coway: Airmega 400S

Rabbit Air A3

Best for: A wall-mountable purifier with a custom filter slot

4.8/10

What we like

Wall-mountable
Filters rated up to 2 years (12 h/day)
5-year warranty

Watch out for

Watts not listed
Filter life assumes 12 h/day

Score breakdown

Smoke CADR 40%

CADR per watt * 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	257 CFM
CADR per watt	Not listed
Quietest setting	20.3 dB
Loudest setting	51 dB
Carbon or odor stage included	Yes
Main filter life	24 months
CADR (pollen / dust / smoke)	315 / 262 / 257 (standard edition)
Coverage	Up to 1,070 ft²
Filtration	6 stages: pre-filter, medium, BioGS HEPA, activated carbon, customized filter, negative ions
Custom filter options	Germ Defense, Pet Allergy, Toxin Absorber, Odor Remover
Filter life	Up to 2 years at 12 h/day
Noise	20.3–51.0 dBA
Power	120 V, 0.84 A max (watts not listed)
Warranty	5 years
Price	Check price

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Specs source:

Rabbit Air: A3

Coway Airmega 300

Best for: The 400's smaller sibling, without an app

4.2/10

What we like

285 CFM smoke CADR
Same Max2 carbon + HEPA filter design as the 400

Watch out for

No app

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	285 CFM
CADR per watt	5 CFM/W
Quietest setting	22 dB
Loudest setting	52 dB
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (smoke / dust / pollen)	285 / 306 / 339
Coverage	2,512 ft² at 1 air change/hr; 1,256 ft² at 2
Filter	Washable pre-filter + Max2 set (activated carbon + HEPA)
Filter life	Max2: 1 year
Noise	22–52 dB(A)
Power	57 W
App	No
Weight	21.4 lb
Price	Check price

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Specs source:

Coway: Airmega 300

#10

Levoit Core 400S

Best for: A cylinder purifier with 231 CFM at 38 W

3.8/10

What we like

6.1 CFM per watt
11 lb

Watch out for

Lowest CADR in this group

Score breakdown

Smoke CADR 47%

CADR per watt 18%

Quietest setting 12%

Loudest setting 12%

Carbon or odor stage included 12%

Smoke CADR	231 CFM
CADR per watt	6.1 CFM/W
Quietest setting	22 dB
Loudest setting	52 dB
Carbon or odor stage included	Yes
Main filter life	Not listed
CADR	231 CFM
Ideal room size	358 ft² (4.8 ACH) / 1,718 ft² (1 ACH)
Filter	3-stage Original filter (carbon, ARC Formula)
Optional filters	Toxin Absorber, Pet Allergy
Noise	22–52 dB
Rated power	38 W
Weight	11 lb
Price	Check price

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Specs source:

Levoit: Core 400S-P

#11

Levoit EverestAir

Best for: Levoit's 354 CFM purifier with adjustable vents

3.8/10

What we like

354 CFM
PM1/PM2.5/PM10 readings

Watch out for

Carbon stage not named on the page
70 W

Score breakdown

Smoke CADR 47%

CADR per watt 18%

Quietest setting 12%

Loudest setting 12%

Carbon or odor stage included 12%

Smoke CADR	354 CFM
CADR per watt	5.1 CFM/W
Quietest setting	24 dB
Loudest setting	56 dB
Carbon or odor stage included	No
Main filter life	Not listed
CADR	354 CFM
Ideal room size	549 ft² (4.8 ACH) / 2,635 ft² (1 ACH)
Filter	3-stage Original filter
Noise	24–56 dB
Rated power	70 W
Sensor	Three-channel laser (PM1.0, PM2.5, PM10)
Model	LAP-EL551S-AUS
Price	Check price

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Specs source:

Levoit: EverestAir-P

#12

Levoit Vital 200S

Best for: A 250 CFM purifier with a pet mode

3.6/10

What we like

Activated-carbon stage
Optional smoke filter

Watch out for

250 CFM is the low end for a large room

Score breakdown

Smoke CADR 47%

CADR per watt 18%

Quietest setting 12%

Loudest setting 12%

Carbon or odor stage included 12%

Smoke CADR	250 CFM
CADR per watt	5 CFM/W
Quietest setting	23 dB
Loudest setting	54 dB
Carbon or odor stage included	Yes
Main filter life	Not listed
CADR	250 CFM
Ideal room size	388 ft² (4.8 ACH) / 1,862 ft² (1 ACH)
Filter	Washable pre-filter + HEPA + activated carbon
Optional filters	Toxin Absorber, Smoke Remover
Noise	23–54 dB
Rated power	50 W
Model	LAP-V201S-WUS
Price	Check price

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Specs source:

Levoit: Vital 200S-P

#13

Winix AT40

Best for: An Energy Star 265 CFM purifier

3.5/10

What we like

Energy Star certified
22 dB minimum

Watch out for

Power not listed

Score breakdown

Smoke CADR 44%

CADR per watt * 17%

Quietest setting 11%

Carbon or odor stage included 11%

Main filter life 17%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	265 CFM
CADR per watt	Not listed
Quietest setting	22.04 dB
Loudest setting	Not listed
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (dust / pollen / smoke)	259 / 244 / 265
AHAM room size	410 ft²
Maximum coverage	1,968 ft² (1 ACH)
Filter	4-stage: True HEPA + activated carbon
Filter life	HEPA 12 months; carbon 12 months
Minimum noise	22.04 dB
Certifications	AHAM, Energy Star, UL, CARB
Weight	10.2 lb
Price	Check price

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Specs source:

Winix: AT40

#14

Winix T810

Best for: A 272 CFM tower with a numeric air display

3.5/10

What we like

272 CFM at 10.2 lb
Carbon rated 12 months

Watch out for

Power not listed

Score breakdown

Smoke CADR 44%

CADR per watt * 17%

Quietest setting 11%

Carbon or odor stage included 11%

Main filter life 17%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	272 CFM
CADR per watt	Not listed
Quietest setting	23.8 dB
Loudest setting	Not listed
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (dust / pollen / smoke)	265 / 267 / 272
AHAM room size	418 ft²
Maximum coverage	2,006 ft² (1 ACH)
Filter	4-stage: True HEPA + activated carbon
Filter life	HEPA 12 months; carbon 12 months
Minimum noise	23.8 dB
Smart	Wi-Fi, Alexa, Google Home
Weight	10.2 lb
Price	Check price

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Specs source:

Winix: T810

#15

Shark BreatheClear MAX (HP362)

Best for: Shark's biggest purifier, with up to 6 years before a filter change

3.5/10

What we like

Filter rated up to 6 years
Activated carbon for odors and VOCs

Watch out for

No CADR or noise figures

Score breakdown

Smoke CADR * 44%

CADR per watt * 17%

Quietest setting * 11%

Carbon or odor stage included 11%

Main filter life 17%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	Not listed
CADR per watt	Not listed
Quietest setting	Not listed
Loudest setting	Not listed
Carbon or odor stage included	Yes
Main filter life	72 months
AHAM CADR	Not published by the maker
Coverage	Up to 1,650 ft² (1 ACH, max fan)
Filter	NeverChange HEPA-exceeding filter + activated carbon
Filter life	Up to 6 years
Power	60 W
Weight	13.56 lb
Price	Check price

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Specs source:

Shark: BreatheClear MAX HP362

#16

Coway Airmega 250S

Best for: A slim, wall-friendly 249 CFM purifier

3.4/10

What we like

Only 8.3 in deep
App and voice control

Watch out for

64 W for 249 CFM

Score breakdown

Smoke CADR 40%

CADR per watt 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

Smoke CADR	249 CFM
CADR per watt	3.9 CFM/W
Quietest setting	22 dB
Loudest setting	54 dB
Carbon or odor stage included	Yes
Main filter life	12 months
CADR (smoke / dust / pollen)	249 / 261 / 230
Coverage	1,860 ft² at 1 air change/hr; 465 ft² at 4
Filter	Washable pre-filter + Max2 (activated carbon + HEPA)
Filter life	Max2: 1 year
Noise	22–54 dB(A)
Power	64 W
Depth	8.3 in
Weight	20.5 lb
Price	Check price

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Specs source:

Coway: Airmega 250S

#17

Shark NeverChange Air Purifier MAX (HP302)

Best for: A 5-year-filter purifier for up to 1,400 sq ft

2.3/10

What we like

Filter rated up to 5 years

Watch out for

No CADR or noise figures
Odor cartridge is a scent, not carbon

Score breakdown

Smoke CADR * 44%

CADR per watt * 17%

Quietest setting * 11%

Carbon or odor stage included 11%

Main filter life 17%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	Not listed
CADR per watt	Not listed
Quietest setting	Not listed
Loudest setting	Not listed
Carbon or odor stage included	No
Main filter life	60 months
AHAM CADR	Not published by the maker
Coverage	Up to 1,400 ft² in one hour (1 ACH)
Filter	Debris Defense washable screen + NeverChange HEPA + Odor Neutralizer cartridge (scented)
Filter life	Up to 5 years
Power	54 W (86.2 W peak)
Weight	13.45 lb
Price	Check price

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Specs source:

Shark: NeverChange MAX HP302

#18

IQAir Atem X

Best for: IQAir's large round purifier, 15 dB on low

2.1/10

What we like

15 dB(A) on its lowest speed
CO2 sensor

Watch out for

No AHAM CADR
No carbon stage listed in the US specs

Score breakdown

Smoke CADR * 47%

CADR per watt * 18%

Quietest setting 12%

Loudest setting 12%

Carbon or odor stage included 12%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	Not listed
CADR per watt	Not listed
Quietest setting	15 dB
Loudest setting	58 dB
Carbon or odor stage included	No
Main filter life	Not listed
AHAM CADR	Not published by the maker
IQAir CADR per speed	65–471 cfm (IQAir's own figures, not AHAM)
Coverage	Up to 1,650 ft² (2 air changes/hr, IQAir)
Power	6–86 W across 8 speeds
Noise	15–58 dB(A) at 3.3 ft
Sensors	PM2.5, CO2, temperature, humidity
Weight	28.7 lb
Price	Check price

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Specs source:

IQAir: Atem X

#19

Honeywell InSight HPA5300

Best for: Three HEPA filters for a 500 sq ft room

2.1/10

What we like

500 ft² at 4.8 air changes
VOC sensor auto mode

Watch out for

No CADR, noise or power figures

Score breakdown

Smoke CADR * 53%

CADR per watt * 20%

Quietest setting * 13%

Carbon or odor stage included 13%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	Not listed
CADR per watt	Not listed
Quietest setting	Not listed
Loudest setting	Not listed
Carbon or odor stage included	Yes
Main filter life	Not listed
AHAM CADR	Not published by the maker
Room size	500 ft² at 4.8 ACH; 2,423 ft² at 1 ACH
Filters	3 × R HEPA + odor-reducing A pre-filter
Sensor	VOC sensor with color indicator
Price	Check price

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Specs source:

Honeywell: HPA5300

#20

Molekule PECOAir+

Best for: PECO + HEPA filtration with CO2 and TVOC sensors

2.0/10

What we like

Widest sensor suite here
H14-grade HEPA media

Watch out for

No CADR
Six-month filters
Loudest low setting here (32 dB)

Score breakdown

Smoke CADR * 40%

CADR per watt * 15%

Quietest setting 10%

Loudest setting 10%

Carbon or odor stage included 10%

Main filter life 15%

* Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

Smoke CADR	Not listed
CADR per watt	Not listed
Quietest setting	32 dB
Loudest setting	55 dB
Carbon or odor stage included	Yes
Main filter life	6 months
AHAM CADR	Not published by the maker
Coverage	Up to 875 ft²
Filter	2 × PECO-HEPA Advanced (H14-grade HEPA media + activated carbon + photocatalyst)
Filter life	Replace every six months
Noise	32–55 dBA
Sensors	PM1.0–10, humidity/temperature, dual TVOC, CO2
Weight	17.5 lb
Price	Check price

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Specs source:

Molekule: PECOAir+

Buying guide: how to choose the right large-room air purifier

Size by smoke CADR, not 'up to' square feet

'Covers up to 3,000 sq ft' usually means one air change per hour, which is too slow to keep up with smoke or pollen. AHAM's guidance is a smoke CADR of at least two-thirds of the floor area (8 ft ceilings). For example, 300 CFM suits about 450 sq ft, and 450 CFM suits about 675 sq ft.

Watch the top-speed noise

Big rooms often need high fan speeds, where most units run at 50–56 dB, similar to a quiet conversation. If you'll run it hard, a model that's quieter at the top (Coway ProX at 46 dB) can matter more than its sleep-mode figure.

Running costs: filters and watts

These run all day, so CADR per watt and filter life add up. Shark's 5–6 year filters and Rabbit Air's 2-year rating (12 h/day) save on replacements. Blueair's Signature and 311i+ Max deliver the most CFM per watt.

Carbon is for odors, HEPA is for particles

HEPA traps dust, pollen, dander and smoke particles. Smells and VOCs need activated carbon, and a thin carbon layer saturates quickly. For heavy smoke or odors, see our smoke & odor comparison.

How this ranking is calculated

Score = weighted average of normalised specs, out of 10. Full method

Smoke CADRSmoke is the hardest of the three AHAM CADR tests, so we use it when listed. Levoit lists one headline CADR, and we use that. Shark, Honeywell, Molekule and IQAir don't publish an AHAM CADR, so those cells are blank and score at the lowest published value in the category. Scale: 200 → 500 CFM.

40%

CADR per wattComputed by us: smoke CADR divided by the maker's rated or maximum power. Higher means more clean air for the electricity, which matters for a machine that runs all day. Scale: 3 → 10 CFM/W.

15%

Quietest settingThe lowest listed noise level, usually sleep mode. Makers measure at different distances, so treat differences of 1–2 dB as a tie. Scale: 30 → 17 dB.

10%

Loudest settingNoise at top speed, which is what you hear when you run it hard for smoke or cooking. Left blank when the maker lists only the minimum. Scale: 60 → 46 dB.

10%

Carbon or odor stage includedYes when the filter in the box includes an activated-carbon or deodorization stage, per the maker. HEPA alone traps particles but not odors or gases.

10%

Main filter lifeThe maker's 'up to' figure for the main HEPA filter. Makers assume different daily run times (noted on each product), so this is a rough guide to running costs. Scale: 6 → 24 months.

15%

Frequently asked questions

Why do some purifiers have a blank CADR?

Shark, Honeywell, Molekule, IQAir and Dyson don't publish an AHAM-verified CADR on their US product pages. IQAir quotes its own airflow figures instead. We leave the cell blank rather than estimating, and score it at the lowest published CADR in the category, so a model without a CADR can never outscore one that publishes it on that criterion.

Is one big purifier better than two small ones?

In one open room, a single high-CADR unit is fine. Air doesn't move well through doorways, so separate rooms are better served by a unit each.

Top pick · 8.3/10Coway Airmega ProX

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Coway Airmega ProX

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Buying guide: how to choose the right large-room air purifier

Size by smoke CADR, not 'up to' square feet

Watch the top-speed noise

Running costs: filters and watts

Carbon is for odors, HEPA is for particles

How this ranking is calculated

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