CADR, Filters & Cost to Run

CADR comparison chart

A reference table rather than an opinion. Every figure links back to the register that published it.

Published September 2, 2026

Last verified September 2, 2026

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The short answer

This chart lists every air purifier covered on this site by certified Clean Air Delivery Rate, with the smoke, dust, pollen and PM2.5 figures, the certified room size, and which register verified it. Nothing here is our measurement; every row is a public record.

This page exists to be a reference rather than an argument. It is the table we wanted when we started and could not find anywhere in one piece.

Every unit, by certified smoke CADR

Certified CADR figures, ranked
Unit	Smoke	Dust	Pollen	PM2.5	Certified room	Verified by
Blueair Blue Pure 211i Max	435	453	450	444	674 sq ft	AHAM VERIFIDE
LEVOIT Core 600S	391	398	436	394	606 sq ft	ENERGY STAR
Coway Airmega 400	376	384	409	380	583 sq ft	ENERGY STAR
Alen BreatheSmart 75i	370	351	431	360	574 sq ft	ENERGY STAR
Blueair Blue Pure 211+	348	347	348	347	539 sq ft	ENERGY STAR
Whirlpool Whispure WPPRO2000	341	339	381	340	529 sq ft	AHAM VERIFIDE
Fellowes AeraMax SE	323	329	372	326	500 sq ft	AHAM VERIFIDE
Blueair Blue Pure 311i Max	283	314	365	298	439 sq ft	AHAM VERIFIDE
Winix T810	270	272	277	271	419 sq ft	ENERGY STAR
Winix AT41	265	259	244	261	410 sq ft	AHAM VERIFIDE
Honeywell HPA6000	257	262	285	259	398 sq ft	AHAM VERIFIDE
Winix C710	248	252	262	250	384 sq ft	AHAM VERIFIDE
Medify Air MA-40	245	257	263	250	380 sq ft	ENERGY STAR
Winix 5500-2	239	244	247	241	370 sq ft	AHAM VERIFIDE
Coway Airmega Mighty AP-1512HH	233	246	240	—	361 sq ft	Manufacturer
LEVOIT Core 400S	231	240	259	236	358 sq ft	ENERGY STAR
Honeywell InSight HPA4300	229	238	245	233	354 sq ft	AHAM VERIFIDE
GermGuardian AC3200	225	230	258	228	348 sq ft	AHAM VERIFIDE
Blueair DustMagnet 5440i	216	231	274	227	335 sq ft	AHAM VERIFIDE
Blueair Blue Pure 411i Max	145	163	180	154	225 sq ft	AHAM VERIFIDE
LEVOIT Core 300S	141	141	141	—	219 sq ft	Manufacturer
Honeywell InSight HPA4100	109	117	117	113	169 sq ft	AHAM VERIFIDE
GermGuardian AC4825	99	116	129	111	153 sq ft	AHAM VERIFIDE
LEVOIT Core Mini	34	39	61	37	53 sq ft	AHAM VERIFIDE

All figures in CFM, read from AHAM’s directory and the ENERGY STAR database on 2026-09-02. Rows marked “Manufacturer” appear in neither register — the figures are the seller’s own and have no independent listing.

How to read this

Smoke is the column to size on. It is the smallest of the three test particles and the one AHAM’s room-size formula uses, which makes it the conservative choice.

Dust is the direct answer if household dust is your problem — it is tested directly rather than inferred.

Pollen is the coarsest particle and the nearest available proxy for large material like shed hair.

PM2.5 covers the fine fraction that penetrates deepest into the lungs, computed from the smoke and dust results.

Verified by is the column most sites do not have. It is the difference between a number you can check and a number you cannot.

Quick picks

Ranked on certified Clean Air Delivery Rate against the room size each unit is certified for, then on what it costs to run. Tap any row for the full write-up.

#	Product	Best for	Certified CADR	Price
1	No photo Highest certified CADR Blueair Blue Pure 211i Max 435 smoke / 453 dust / 450 pollen, AHAM VERIFIDE.	Open-plan spaces above 500 sq ft	435CFM smoke AHAM VERIFIDE	Check price on Amazon
2	No photo Highest ENERGY STAR figure LEVOIT Core 600S 391 smoke / 398 dust / 436 pollen across 606 certified sq ft.	Large open-plan rooms	391CFM smoke ENERGY STAR verified	Check price on Amazon
3	No photo Best efficiency Honeywell InSight HPA4300 229 certified smoke CFM on 31 watts.	True HEPA on the lowest power draw	229CFM smoke AHAM VERIFIDE	Check price on Amazon

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The same units, by efficiency

CADR tells you what a machine delivers. Integrated Energy Factor — CFM per watt — tells you what it costs you to get it, and the two are close to uncorrelated.

Certified efficiency, CFM per watt
Unit	CFM / watt	Smoke CADR	kWh / yr	Electricity / yr
Blueair 211i Max	9.0	435	256	$47
Blueair 311i Max	8.4	283	193	$35
Blueair 411i Max	8.2	145	110	$20
Honeywell HPA4300	7.4	229	185	$34
Honeywell HPA6000	7.3	257	207	$38
Honeywell HPA4100	6.9	109	95	$17
Alen BreatheSmart 75i	6.9	370	304	$56
Winix C710	6.2	248	235	$43
Coway Airmega 400	6.1	376	366	$67
LEVOIT Core 600S	6.0	391	387	$71
Blueair DustMagnet 5440i	5.9	216	220	$40
LEVOIT Core 400S	5.8	231	237	$43
Blueair Blue Pure 211+	5.8	348	350	$64
Winix AT41	5.6	265	272	$50
Medify Air MA-40	5.6	245	261	$48
Fellowes AeraMax SE	4.9	323	392	$72
Winix 5500-2	4.1	239	356	$65
GermGuardian AC3200	4.1	225	324	$59
GermGuardian AC4825	3.5	99	182	$33
Whirlpool WPPRO2000	3.0	341	657	$120

A three-fold spread from top to bottom. The most efficient machine here also happens to have the highest CADR, and the least efficient is mid-pack on output — efficiency is not something you pay for in this category, it is something you either notice or do not.

Electricity costs on this page use 18.34¢ per kWh, the U.S. average residential price for June 2026 from the U.S. Energy Information Administration, Electric Power Monthly, Table 5.3. Your rate is on your bill and is probably not this one; multiply the kWh figure by your own rate and you have your number.

Common questions

Which air purifier has the highest CADR?

Of the units we cover, the Blueair Blue Pure 211i Max, at 435 certified smoke CADR and 453 dust, giving a certified room size of 674 square feet. It is also the most efficient at 9.0 CFM per watt, which is unusual — high output and high efficiency do not normally travel together.

Why do some units show a manufacturer figure rather than a certified one?

Because they appear in neither register. Two well-known machines on this site are in that position, and we mark them so rather than presenting their numbers as equivalent to verified ones.

What is PM2.5 CADR?

A fine-particle figure computed from the smoke and dust results, covering particles 2.5 microns and smaller — the fraction that penetrates deepest into the lungs. Both registers publish it now. If your concern is cooking, traffic or wildfire smoke, that is the column to read.

Sources

Figures were read on the dates shown against each source. If one has changed, or if we have got something wrong, tell us and we will correct the page.