6 Best High CADR Air Purifier In 2021

Is hard to determine which is the best air purifier with every manufacturer offering their own benchmark testing. Fortunately, AHAM, the independent home appliance organization came out with a standardized testing method which is the CADR we knew today. To make life easier for you, we have compared every model that is listed on the AHAM database based on the size, filtration setup, and specification. Find out which is the best CADR air purifier that you can buy right now along with their pros and cons.

2021 Best High CADR Air Purifier

NoImageAir PurifierOnline Price (Amazon)FiltrationCoverageScore
1Alen BreatheSmart 75iAlen BreatheSmart 75i Air Purifier


3-stage1,300 sq. ft. (121 m2)4.5
2GermGuardian AC9200WCAGermGuardian AC9200WCA Air Purifier


5-stage378 sq. ft. (35 m2)4.5
3Medify MA-112 dehumidifierMedify MA-112 Air Purifier


4-stage2,500 sq. ft. (232 m2)4.5
4Blueair Classic 605Blueair 605 Air Purifier


3-stage775 sq. ft. (72 m2)5
5Blueair Pro XLBlueair Pro XL Air Purifier


3-stage1180 sq. ft. (110 m2)5
6Gocheer GH-Monster 4-in-1 H13 Air PurifierGocheer GH-Monster Smart Air Purifier


4-stage2,500 sq. ft. (232 m2)4

How Do We Measure?

Having a high clean air delivery rate should not be your only consideration when purchasing an air purifier. There are other valuable benchmarks that can help you decide whether the air purifier you're about to purchase is the right one. To save you the trouble in going through every specification, here are the features you will also need to think about for the best CADR air purifier.

  • Clean Air Delivery Rate (CADR) - We're using the overall CADR metric between dust, pollen, or smoke. The higher the output, the swifter an air purifier can remove the particulates in a room. Never go below 200 cubic feet per minute.
  • Room size - A good benchmark to see if the strong CADR matches the recommended room size coverage. Go with a large air purifier that can cover at least 300 square feet with 2 air changes per hour.
  • Dimension - In general, high CADR air purifiers are big and bulky that occupy a lot of interior space. So think carefully where you intend to place the model, measure the model dimension and make sure the device can fit in.
  • HEPA filter - A must-have filtration in any air purifier regardless of the specification. Make sure it is equipped with an H13 or true HEPA filter instead of a HEPA-type filter with an inferior efficiency.
  • Carbon filter - Another must-have filter that covers smoke, toxic fumes, and odors. Go with a dedicated activated carbon filter rather than a carbon pre-filter with a thin sheet.
  • Addon filtration - From germ-killing UV-light, negative ion generator, to antimicrobial, anything that can help clean the air would be welcome with open arms. Note that the CADR does not take into account the addon filtration.
  • Noise level - If you're considering using an air purifier during work or sleep, go with a model that outputs less than 50 decibels at normal speed.
  • Cost of ownership - There's no denying that the absolute best CADR air purifier will cost you a bomb (above 1 grand). So buy what you can afford to own and maintain as an air cleaner will last for ages.

Quick Summary

Alen BreatheSmart 75iGermGuardian AC9200WCAMedify MA-112 dehumidifier
Alen BreatheSmart 75i Air PurifierGermGuardian AC9200WCA Air PurifierMedify MA-112 Air Purifier
Recommended Room Size
1,300 sq. ft. (121 m2)378 sq. ft. (35 m2)2,500 sq. ft. (232 m2)
4.5 ⭐ out of 54.5 ⭐ out of 54.5 ⭐ out of 5
Amazon Price

When the indoor air is at an unhealthy level with visible PM10 pollutants, you will need a high CADR air purifier like Alen BreatheSmart 75i. This console-size air cleaning machine stands at an 18.5 x 27 x 11.5 inches dimension and a hefty 32 pounds weight. Not the biggest model on this list but it will still take up some room space. The classic side air inlets setup supports many customizable panels that you can swap to match your interior design. There is also an air quality indicator that illuminates blue, yellow, or red light to reflect on the room's air condition. Fitting and build quality are second to none as evidence by the Lifetime warranty (with subscription filter).

With tons of embedded features, usability is great with the Alen BreatheSmart 75i air purifier. You can cycle through the 4 fan speeds, optional ionizer, child-lock, 3 preset timers, and our favorite auto mode. With energy-saving auto mode, BreatheSmart 75i will only run at a higher speed when there is an increase of airborne pollutants in the air. The advanced Smart Filter calculates the filter life so you only have to replace the dirty filter when it is completely worn out.

Here are Alen BreatheSmart 75i key specification:

  • Air filtration - Washable Pre-filter, HEPA-Pure Filter BF35, Ionizer
  • Room coverage - 1100 sq. ft.
  • Dust CADR - 347 cfm
  • Pollen CADR - 347 cfm
  • Smoke CADR - 347 cfm
  • Warranty - Lifetime

Here's why we picked Alen BreatheSmart 75i air purifier. It delivers a strong 347 cubic feet per minute for dust pollen, and smoke. Overly exceeded our minimum threshold. Complemented by the 150-285 cfm of airflow delivery rate, recommended room size is up to a wide 1,100 square footage. Ideal for large room sizes like living room, bedroom, basement, garage, kitchen, and home office. With WhisperMax technology, the 42 to 56 decibels noise level is on the quiet side despite the high airflow output. Suitable for work and noise use as long as you keep the fan speed at low. Power consumption is a tad high between 64 to 105 wattages output per hour. You should still run it 24x7 but with Auto mode enabled to conserve energy.

With its strong CADR, Alen BreatheSmart 75i can remove all types of airborne pollutants but you do need to choose the right set of filters. The first-stage pre-filter traps large particles like dust and prevents it from clogging the HEPA filter. The default HEPA-Pure filter removes 99.97% of airborne particulates as small as 0.1 microns including bacteria and viruses. For smoke filtration, you will need to upgrade to mold removal HEPA-Silver filter, HEPA-FreshPlus, or HEPA-OdorCell filter that comes with additional deodorization filtration. Lastly, the optional ionizer generates millions of negative ions that attract and pull down positive ions pollutants in the air for the filter to capture.

The drawback with Alen BreatheSmart 75i air purifier is obviously the cost. Not only you will have to take in the 700+ selling price, the upgradable filter will add another 30-40 bucks to the cost annually. Noise level is also on the louder side when running at a higher speed. It can be distracting for those that are working from home or have a baby they would need to take care of.

In short: A premium, high CADR HEPA air purifier that offers customization in filtration and outlook.

online price**
±749.00 $$$$$$$/ 7

(annual filter cost ±66-99)


The best bang for buck air purifier in the list with a high CADR. GermGuardian AC9200WCA is a highly regarded air cleaner that offers great value at an accessible price. It looks modern and sleek thanks to the side air inlet and clean removable panel. At a width of 17 inches in width and 27 inches in height, it commands little interior space compared with other big boys here. The 20.7 lb in weight is still manageable for room to room purifying when needed. Build quality is good for daily use with no signs of off-gassing or poor fitting.

Moving to the easy to use controls. You have a standard 3 fan speeds, timer with preset 2/ 4/ 6 hours, and filter change indicator that alerts you to replace the filter or UV-C light. You also have the option to disable the ionizer and UV-C light when not needed. No autonomous here but you do get an extended 3 years warranty that covers any manufacturer defects.

Here are GermGuardian AC9200WCA key specification:

  • Air filtration - Pre-filter, True HEPA filter, Activated Carbon Filter, Ionizer
  • Room coverage - 378 sq. ft.
  • Dust CADR - 310 cfm
  • Pollen CADR - 346 cfm
  • Smoke CADR - 244 cfm
  • Warranty - 3 years

At around 300 dollars after discount, GermGuardian AC9200WCA has an impressive clean air delivery rate of 310 cfm for dust, 346 cfm for pollen, and 244 cfm for smoke. At an ideal speed and room temperature, it can cover a respectable 378 square footage of room size. Highly suited for a studio, small apartment, bedroom, living room, basement, playroom, and nursery home. Noise level and power usage are also on the lower tier so no problem running it during work or sleep.

The biggest strength of the GermGuardian AC9200WCA air purifier is not its CADR but the 5-stage filtration. Starting with the reusable pre-filter that trap large particles and protects the HEPA filter from being damaged by sharp objects. The true HEPA filter removes 99.97% finer PM2.5 contaminants like mold, pollen, pet dander. The activated carbon filter neutralizes household smoke, chemical fumes, and odors through chemical adsorption. For bacteria, viruses, and other pathogens, the UV-C light will permanently kill it with no chance of growth. Finally, the ionizer electrostatically charges negative ions that merge and weigh down particles in the air for the filter to capture.

On to the few drawbacks we need to touch on. While GermGuardian AC9200WCA does not have an outrageously expensive price tag, the annual filter cost can be a burden especially when indoor air quality is less than ideal. The UV light bulb intensity will drop resulted in reduced performance if is not replaced in time. Another minor complaint is the lack of air quality indicator and Auto mode that can be useful at times. Not a deal-breaker as long as you understand what you're getting at.

In short:A high CADR HEPA 5-stage air purifier without the outrageous price tag. The perfect balance between performance and cost.

online price**
±499.99 $$$$$$/ 7

(annual filter cost ±128-182)


A clean, modern air purifier with a touch of elegance. Medify MA-112 is considerably small compared with some of the CADR models here. At a 16 x 28 x 15 inches in size, you will have no issue finding a place for it. The heavy 32 pounds weight does pose more of a problem when you try to move it around. Otherwise, this is a very livable air cleaning machine.

Available in 2 colors, Medify MA-112 air purifier will work like a charm. You can cycle through 4 variable speeds, shutdown timers, child lock, and dimmer light. A bonus in Medify MA-112, there is a built-in sensor to support the air quality indicator, sleep, and auto mode. The air cleaner will automatically run at a higher speed when there is a large concentration level of pollutants in the air. Lastly, a fairly accurate filter replacement indicator will remind you to change the filter after 3,000 hours of air purification.

Safety-wise, Medify MA-112 air purifier is CARB (California Air Resources Board) ozone-safe, AHAM tested, and ETL listed. Build quality if tight with the goal set for long hours of operation. The lifetime warranty is the perfect testimonial of its long-term durability providing only an original Medify filter is used.

Here are Medify MA-112 key specification:

  • Air filtration - Pre-filter, H13 HEPA filter, Activated Carbon Filter, Ionizer
  • Room coverage - 2,500 sq. ft.
  • Dust CADR - 950 cfm
  • Pollen CADR - 950 cfm
  • Smoke CADR - 950 cfm
  • Warranty - Lifetime

Great for hypersensitive person, Medify MA-112 air purifier CADR ratings is at an impressive 950 cubic feet per minute (cfm). A remarkable achievement considering its segment. With the high CADR. Medify MA-112 can clean 2,500 square footage of room size in 30 minutes or 2 air changes per hour. Double the air changes per hour to 4 (15 minutes), it can still reach 1,250 of air cleaning space. Suitable for living room, master bedroom suite, basement, nursery, and home office. Unfortunately, the noise level will take a hit to accommodate the strong airflow. Anticipate a loud 70 decibels when the air purifier is at max speed. As an Energy Star rated model, power usage is reasonable for its class. You can run it 24x7 with little impact on your utility bill.

Combining the best CADR and Medical-grade filtration, no pollutants will be too difficult for Medify Air MA-112 air purifier. The dual air intake will pull in air from both sides that will go through the first round of filtration by the pre-filter. With both pre-filters capturing all the large particles, the H13 HEPA filter will trap remaining microscopic particles as small as 0.1 microns with an efficiency of 99.9%. This includes lead dust, mold, pollen, pet dander, bacteria, and virus carrier. The activated carbon filter absorbs odor from pets, cooking, and toxic fumes from VOCs, asbestos, cigarette smoke, formaldehyde, and benzene. The optional ionizer diffuses charge negative ions to latch and merge pollutants ions in the air. The latched particles will fall from the increased weight allowing the medical-grade filter to capture.

There is nothing bad to say about Medify H13 air purifier when money is no issue. Sadly, not everyone has the luxury to do so you might be better off with a slightly lower variant Medify model. Like always, the filter replacement set will cost you dearly particularly in an unhealthy air environment. The whirring fan noise can be distracting when you leave it at full blast. Overall, if you are staying in a single-floor home or studio room with limited partitions, investing in Medify H13 air purifier for a lifetime of clean air might not sound too bad after all.

In short: The top-of-the-line Medify H13 air purifier with the highest CADR ratings and price tag. Look out for the recurring filter cost as well.

online price**
±595.00 $$$$/ 7

(annual filter cost ±278-417)


The best comes from Sweden. Blueair Classic 605 air purifier is nothing short of amazing when it comes to clean air delivery rate. This white powder-coated machine host a series of HEPA air filtration that you will not find elsewhere. At a large 20 x 26 x 13 inches in dimension and a 35 lb weight, its simplistic approach blends well in the modern exterior but at the cost of movability. You will have to hard time moving it around even with the 4 durable casters.

Blueair 605 is easy to use once the Wi-Fi setup is completed. There are 3 buttons at the top: the fan speed, filter reset button, and Wi-Fi button. The Wi-Fi button allows phone pairing for advanced function and remote access. By downloading the Blue Friend app at iTunes or Play store, you can use your smartphone to control the fan speed, LED light, child lock, or set up night mode. There is also a scheduler to help manage Blueair 605 operational hours and other useful information. Overall, build quality is exceptional that guarantees no off-gassing from its eco-friendly materials. The 5 years warranty will give you a long peace of mind throughout the course of ownership.

Here are Blueair 605 key specification:

  • Air filtration - HEPASilent Technology with Particle Filters and SmokeStop Filter
  • Room coverage - 775 sq. ft.
  • Dust CADR - 500 cfm
  • Pollen CADR - 640 cfm
  • Smoke CADR - 500 cfm
  • Warranty - 5 years

AHAM verified model, Blueair 605 can quickly clean the air in a room with CADR ratings of 500 cfm for dust, 640 cfm for pollen, and 500 cfm for smoke. Airflow delivery rate is at a max 650 cfm that supports a large room size of 775 square footage. Noise level is surprisingly livable even with the strong airflow output. It generates a low 23 decibels when running at the lowest speed to a normal conversation 62 decibels at max speed. The same goes with the power consumption, anticipate a low 15 wattage hourly to a reasonable 100 watts when it is set to max.

No airborne particles will be able to get away from Blueair electrostatic and mechanical filtration. First, the drawn-in air will be electrically charged in the encapsulated particle-charging chamber. The charged particles will be more adhesive to the gradient structure particles filter resulting in 99.97% efficiency as small 0.1 microns. This includes dust mites, mold spores, pollen, bacteria, and viruses. On top of it all, there is antibacterial polypropylene fibers coat that inhibits the growth of microorganisms. Lastly, the SmokeStop Carbon filter will neutralize toxic fumes, chemical smoke, and household odors including ozone.

Blueair 605 air purifier has most of the drawbacks of a high CADR air purifier. It is designed to be bulky in order to fit in the large fan motor and filters. The replacement filter will cost you between 230-460 annually if you follow the exact interval timeline. The lack of auto mode is disappointing, but the expensive price tag is the biggest stumbling block for most people. Nonetheless, nothing is more valuable than your health. Downgrade to 405 or 205 series if you want something cheaper but with an identical specification.

In short: A HEPASilent air purifier that gives you more than just high CADR ratings. The high price tag and maintenance fees will limit its appearance though.

online price**
±829.99 $$$$$$$/ 7

(annual filter cost ±230-460)


Forget about the M and L variant Blueair Pro XL is the best CADR air purifier you can get right now. This premium, niche air cleaning machine comes in at a tall 20 x 44 x 10 inches in dimension. While the width is still manageable, the 71 pounds weight limits badly on its versatility. You'll have to pick the right spot to place it so Blueair Pro can cover multiple places of air cleaning at one go. With the assuring 5 years warranty, build quality is outstanding with no signs of off-gassing or poorly aligned case. After all, this is Sweden's best of the best.

Blueair Pro XL is straightforward to use with the inclusion of the Air Intelligence Module. In auto mode, the air purifier will only run at higher fan speeds when indoor air quality is deteoriating. You can still use the manual 3 speeds mode but it is not necessarily at this point. A red filter light indicator will illuminate between 6 to 12 months when the trio filter requires replacing. Lastly, there is a dual air quality indicator that displays the air-suspended particles (PM2.5) and gaseous contaminants (GAS) levels. 1 green bar equals good indoor air quality while 3 bars (green, yellow, and red) equals unhealthy air quality level.

Here are Blueair Pro XL key specification:

  • Air Filtration - HEPASilent Technology with Blueair Pro Particle Filters and Pro SmokeStop Filter
  • Room Coverage - 1180 sq. ft.
  • Dust CADR - 950 cfm
  • Pollen CADR - 900 cfm
  • Smoke CADR - 800 cfm
  • Warranty - 5 years

Here's why Blueair Pro XL is the undisputed, best high CADR air purifier for residential use. It is tested by AHAM with the CADR ratings of 950 cfm for dust, 900 cfm for pollen, and 800 cfm for smoke. The German-engineered fans output a strong 990 cfm airflow distribution with 1180 square footage coverage. Ideal for large room sizes like office, living room, nursery home, classroom, meeting hall, cafeteria, and study area. Noise levels can be subtle between 32 to 58 dB(A) but energy usage is high with up to 256 wattages per hour. This is not the model you want it by the bedside.

With a trio encapsulated particle-charging chamber setup, the ionizer electrostatically charges particles into the filtration. The particles will be more sticky to the V-shaped dense filter allowing the Pro3 Particle Filter to swiftly remove 99.97% of the biological pollutants as small as 0.1 microns. The trio Pro SmokeStop filter will absorb chemical fumes and odors including radon, ammonia, CO, CO2, VOCs, ozone, and asbestos that is common in old buildings. As an extra layer of protection, the filter media is made from waterproof, natural antibacterial polypropylene fibers that inhibit mold and bacteria growth. Very important to curb down the reintroduction of germs.

Another common theme in high CADR air purifiers. Blueair Pro XL is big and hefty which heavily impacted its mobility. The 32+ pounds weight can be a safety concern when you have children or pets playing near the machine. You also have to bear the 2,000+ dollar price tag and exuberance filter costs. Perhaps the biggest letdown at this price tag is the lack of Wi-Fi support, remote control, and timer features. This is a very niche product that caters to those with severe respiratory issues.

In short: Blueair Pro XL is the ultimate CADR purifier that nobody will buy. If you can afford one, this could be the smartest health decision you will ever make.

online price**
±2,427.00 $$$$$$$/ 7

(annual filter cost ±540-1080)


A surprising entry to the CADR air purifier world, Gocheer GH-Monster is a modern, smart air purifier that is still somewhat accessible. The dual air intake setup comes in at a 15.9 x 31.9 x 14.8 inches dimension that is not too big for a high CADR air purifier. Weight-wise, the 34.9 pounds weight is well supported by the integrated 360 degrees castor wheels and universal pulley. You will have no problem moving Gocheer GH-Monster around. Finishing up the exterior tour is the front vertical LED light that illuminates when the air purifier is turned on.,/p>

Gocheer GH-Monster Smart air purifier is a powerhouse when it comes to usability. The glossy touch controls panel allows the easy operation of the 4 fan speeds, shut down timers, lighting dimmer, child lock, and filter reset. With the built-in laser particle sensor, you can activate sleep mode and auto mode that automatically set the fan speed to high when a high concentration level of indoor airborne pollutants is detected. Another unique feature in Gocheer GH-Monster is the Wi-Fi smart app remote control. You can monitor and control the air purifier remotely via your smartphone or tablet. A convenient and seamless experience that can be done at a click of a button.

On the whole, Gocheer GH-Monster 4-in-1 air purifier is very well put together for everyday use. It is also ETL/ UL listed, CARB approved, and asthma & allergy-friendly certified by the Asthma and Allergy Foundation of America.

Here are Gocheer GH-Monster key specification:

  • Air filtration - Pre-filter, Polypropylene pre-filter, H13 HEPA filter, Antibacterial cloth filter, Activated Carbon Filter
  • Room coverage - 2,500 sq. ft.
  • CADR - 1000 cfm
  • Warranty - 1-4 years

Gocheer GH-Monster is the best CADR air purifier you can get right now. It features an industry-leading 1000 cfm CADR that can swiftly curbs down airborne allergies before it causes any harm. The dual suction covers 2,500 square footage of space with 2 changes per hour/ 30 minutes. You can also increase the air changes frequency clean to 4 or every 15 minutes. Ideal for living room, hospital, office, basement, studio apartment, or single-storey home. Noise output can be whisper-quiet if you run it in sleep mode at around 25 decibels. Power consumption is also decent at around 35% more energy-efficient over the same category models.

Double the filters, double the protection against airborne pollutants. Gocheer GH-Monster Smart air purifier 4/5 stage filtration will protect you from inhaling harmful allergens. The twin washable pre-filter and polypropylene pre-filter blocks pet hair, lint, fiber and prevent the H13 filter from clogs. The dual medical-grade HEPA filter capture 99.97% allergen as small as 0.3 microns. The antibacterial cloth filter reduces the growth and spread of mold spores, bacteria, and viruses. The charcoal-based activated carbon filter neutralizes chemical fumes like VOCs, asbestos, radon, ozone, cigarette smoke, and formaldehyde.

Gocheer GH-Monster Smart might have every single premium feature available, it comes with a hefty price tag that can deter its usability. Besides the cost, you will have to account for the recurring dual filter maintenance fees that can go as high as 260 dollars in an unhealthy air environment. It will not run properly if you do not replace both sides of the filters. So if you are tight on budget or currently staying in a small home or shared room, you might be better off with a smaller CADR air purifier.

In short: Expensive it may be, this could be the single H13 HEPA air purifier you will ever need for your home.

online price**
±599.00 $$$$$$$/ 7

(annual filter cost ±129.99-260)

** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is provided by cleanairprice.com. Accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.


What Is CADR And Why Is It Important

CADR or Clean Air Delivery Rate is a metric developed by AHAM to measure the air purifier's cleaning performance. The CADR rating is based on the volume of clean air produced in cubic feet per minute (cfm) or cubic meter per hour (m³/h). Three types of particles will be tested (dust, pollen, smoke) with individually assigned CADR scores. Dust CADR represents medium particles, Pollen CADR represents coarse particles and Smoke CADR represents tiny particles. CADR is important because it gives you an indication of whether an air purifier has the capacity to effectively clean your room. The higher the CADR ratings, the faster an air purifier can clean the air.

How Is CADR Tested

The Association of Home Appliance Manufacturers (AHAM) developed the ANSI/AHAM Standard AC-1 procedure for testing. Running at the highest fan speed, the air purifier is put into a 1,008 cubic feet test chamber to measure the efficiency it can remove the following three sizes of particles in the air:

  • Dust particles between 0.5-3 micron
  • Pollen particles between 5-11 micron
  • Smoke particles between 0.09-0.1 micron

3 independent tests will be performed and rated on how well an air purifier will perform indoor. With CADR ratings, you can calculate the recommended room size an air purifier can cover or vice versa. Note that AHAM will randomly select an air purifier for independent testing to ensure the selected model met the airflow performance levels.

What Are The Benefits Of CADR

The benefit of a CADR rating is it gives the consumer a standardized metric to compare air purifiers' airflow and filtration efficiency. It prevents manufacturers from coming out with their own benchmark testing and misled the consumers through disingenuous marketing. For example. some manufacturers will use particle counters to manipulate a favorable air cleaning efficiency of their air purifiers without accounting for other important data.

What Are CADR Limitations?

CADR rating is a good benchmark for comparing air purifiers but it does not paint the complete picture. Here are CADR limitations:

  • The test primarily focuses on particles as opposed to gases.
  • The test is conducted on the highest fan speed only without factoring in the noise level.
  • The CADR is tested with a new, clean filter that does not reflect the actual filter media size and the performance of the air purifier over time.
  • It does not account for the other type of filtration efficiencies such as ionizer and UV-light.
  • AHAM testing and CADR rating are not mandatory programs therefore not all manufacturers will participate in the test.
  • The test does not measure any ozone generation, build quality (including motor), energy usage, and filters media size.


Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.
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