That aside, its a compact, attractive machine, and its display-shutoff feature (which turns off the bright LED control panel) makes it especially suited for bedrooms. So we deliberately countered that setup in our Los Angeles office, where we tested our top pick, the Coway AP-1512HH Mighty, and our large-space pick, the Blueair Blue Pure 211+, in handling ongoing smoke from burning incense sticks. It has historically cost upwards of $750; we have seen it dip to near $500 at times, which brings it closer to being competitive with our other picks, but again: only if you really need to clean a vast space. Perfect for bedrooms, playrooms, and living rooms, the Mighty is one of the best-performing, most durable, and most economical purifiers weve tested. The numbers get worse when you factor in running costs: Five years of running the Coway on medium and replacing the filters on schedule will max out at around $270, less if you dont pay the high New York electricity rates we base our calculations on. Both third-party filters performed almost identically to the genuine Coway filter: Whereas the Coway filter reduced the smoke levels by 97.1% in 30 minutes on high and 87.1% in 30 minutes on medium, the Cabiclean filter lowered the smoke levels by 97.3% and by 87.7%, respectively, while the Durabasics filter reduced the levels by 96.3% and 85.1%, respectively. *At the time of publishing, the price was $250. The Coway Mighty is also unusually easy to live with, as its quiet and compact, and its display can go dark at night, making it a good fit for master bedrooms, playrooms, and living rooms or dens. Hence our emphasis on air changes per hour. And we like the GermGuardians clean looks and clever night-light feature: a small blue circular LED that glows through the machines seamless white faceplate.
But square-footage ratings are essentially meaningless when youre comparing two rooms with different ceiling heights. But its only slightly more powerful than our top pick, the Coway AP-1512HH Mighty, yet costs $200 more. You should keep the doors and windows closed when using an air purifier. But the horizontal airflow also means theres a constant breeze in the room when they are operating, which might not be desirable. These results make the Blue Pure 211+ one of the most efficient purifiers weve tested, as well as one of the most consistent on different settings. We do dismiss air purifiers that rely on ozone (O3, a molecule composed of three oxygen atoms) to purify the air. Youd never forget that you have a purifier in the room. What settings should you run an air purifier on? Can HEPA Air Purifiers Capture the Coronavirus? We set a minimum target of 4 ACH: Machines that dont meet this number for a given room size are likely to have trouble keeping the air clean, especially in times of high pollution, such as during wildfires. Neither Blueair model is true-HEPA rated, but both are certified by AHAM to have clean air delivery rates (CADR) of 350 and 250, respectively, and they performed exceptionally well in our testing, where we measure each purifiers effectiveness at capturing HEPA-standard 0.3-micron particles. The Mila is now available on Amazon. The Round Console was also weaker on specs and higher priced than the Coway, at $300. We have long recommended running air purifiers on high for an hour and thereafter running them on the quiet/medium setting to create and maintain clean air in the home. We were comforted to know that the company instituted a bug bounty program in 2021, which allows security researchers to report bugs they find for cash rewards. Then we use a professional particle counter to directly measure how well the purifiers remove the smoke from the air. (Or less: We calculate electricity costs at New Yorks rates, which are 50% above the national average.). He conducted these tests in a roughly 700-square-foot room with 14-foot ceilings, a space with a total of nearly 10,000 cubic feettwice the volume of his 600-square-foot, 8.3-foot-ceiling New York test space, and bigger than what the large-space purifiers he tested were rated for. Another knock on the Aair: The filters last only six months, and replacements cost $200. Most offer a square-footage rating because its easy for a prospective customer to take their rooms dimensions and pick a purifier accordingly. 
And its performance comes at a steep price: The HM400 typically costs more than $500 up frontalthough price can vary based on color, sometimes by as much as $100and replacement filters usually cost a bit more than $200. The Blueair Blue Pure 411 series encompasses three similar models: the original Blue Pure 411 (a former pick for small spaces), the Blue Pure 411 Auto, and the Blue Pure 411+. In our three-hour test of the Mighty, that machine reduced a heavy load (15 matches worth) of smoke by 99.9% in the first hour on high and maintained that level for the next two hours on medium. (Installing the VOC filter also lowers the machines CADR to just 70.6 cubic feet per minute.). And when we tested it during ongoing smoke conditions in a vast Los Angeles conference room of nearly 10,000 cubic feetmore than twice as large as the Mightys specs would seemingly allowit cut particulate pollution by almost 70% in an hour.
Its also an attractive, quiet-running machine, so its easy to live with. With a clean air delivery rate (CADR) of 260 cubic feet per minute on high, the Core 400S is slightly more powerful than our top pick, the Coway Mighty (which has a CADR of 240). If you want a basic smart air purifier, its an attractive option, as it connects with Amazon Alexa and Google Assistant for voice control, in addition to having its own app. But in our tests it performed significantly worse, achieving just 77.4% and 55.1% reduction on its highest and medium (speed 6) settings, respectively. As the CDC writes: The best way to prevent illness is to avoid being exposed to this virus.. If youre using a Blue Pure 211+ to purify a space that the Coway Mighty can handle, thats a lot of wasted electricity. On high, it reduced a heavy load of 0.3-micron smoke particles by 99.9% in 30 minutes; on medium, it reduced them by 94.2%. It simply doesnt move enough air to work effectively in anything bigger than a bedroom.
We recommend both just as highly.
The Airmega 200M has a square grille rather than a round onebut thats the only major physical difference. These findings all mean that the Molekule Air is not remotely worth its high price: usually $800 up front, versus a typical $200 to $225 for the Coway Mighty, a much more capable machine on particulates. 
We think its wisest to follow the manufacturers recommendation, but we have also found that HEPA filters continue to perform almost like new even after a year of continuous use, so if you dare to push a few months beyond the stated filter lifespan, its likely not a crisis. Lets begin by defining what the IKEA Frnuftig is not: a true-HEPA purifier, or a very powerful purifier, period. The effectiveness of such features is dubious, and it draws additional electrical power. Other criteria also matter. It has kept its place for so long for many reasons. In a 350-square-foot room, it can deliver 5.3 air changes per hour (ACH) based on its CADR measurements, nearly identical to the results from the Coway Mighty and slightly more than what the Winix models can achieve. Same herebut dont believe the hype. Some caveats apply: Tim was careful to seal the filter around its entire perimeter with clear pro-strength packing tapeany gap would have let unfiltered air pass through, same as on dedicated air purifiers. The Coway Airmega 200M is virtually identical to our top pick, the Coway AP-1512HH Mighty. Two minor knocks against it: The air-quality indicator lamp, a bright blue LED, shuts off only when the unit is on its slowest setting, and Blueair recommends replacing the filters every six months, pushing annual costs to $80 (versus about $50 for the Coway and Winix models). Over five years, the GermGuardian will cost roughly $900 versus the Coways $470 or so. It agreed to withdraw these claims as part of the NAD/NARB cases, because theyre untrue. The features efficacy is uncertain (although it definitely increases the machines power consumption). The Coway Airmega 300, our previous pick for large spaces, is similar in specs to the Blueair Blue Pure 211+, our current large-space pick, which typically costs much less. If you need to purify the air in a seriously large space, we recommend the Blueair Blue Pure 211+. Its a really interesting machine, straddling the line between appliance and furniture, and it incorporates a second function: It has a built-in, 20-watt wireless device charger. The Core 400S has four speed settings versus the Mightys three, and on its third gearwhich, at 46 decibels, is the highest sub-50-decibel setting that we consider quiet enough for conversation or TV watchingit outperformed the Mighty, removing 96.3% of smoke particles in 30 minutes, versus 87.7%. The Pure Companys Large Room Air Purifier usually costs $400 but has lower specs than those of the much cheaper Coway AP-1512HH Mighty. Thats almost inaudible. We asked Coway about this problem, and a spokesperson replied that Coway is aware of the issue and working on strengthening the fans balancing mechanism. If you have specific concerns about VOCs, the HM400 is by far the best portable air purifier weve ever found. Many employ a second filter, containing adsorbent compounds such as activated carbon, to capture gases and odors (volatile organic compounds, or VOCs)but we have not found these to be very effective. Second, depending on what a manufacturer determines as poor enough air quality, an automatic setting may let the air in your home get quite laden with particulates before kicking the purifier on.
A draft or an open door can draw unfiltered air into a room faster than the purifier can deal with it. It fell below that limit, to 45.4 decibels, on speed 3. The Z2000 (the medium room model), which by TruSenss claimed specs is a direct competitor to our top pick, the Coway AP-1512HH Mighty, has a CADR of 112/117/95 on dust/pollen/smokein every case less than half the Coways CADR ratings, and below those of even our top pick for small rooms, the Levoit Core 300. Compared with tower-style purifiers weve tested, which have smaller footprints but are much taller, and compared with our large-space and VOC picks, which are monolithic, the Coway AP-1512HH Mightyespecially the white versiontakes up less visual space. It has delivered exceptional air purification at the 0.3-micron HEPA standard in our testing.
And the company uses 2 air changes per hour to calculate its square-footage ratings, whereas we set 4 ACH as a minimum. In 2018, we specifically tested this advice, and our results bear it out. Rather than address them individually, we turned them into a poem, as their names (and this isnt an exhaustive list) are quite lyrical: Sumgott, Koios, UNbeaten, Zibrone; At a cost of $1,000, the Aeris Aair 3-in-1 Pro is a high-end purifiera growing category that we plan to explore in depth in the future. It has a more contemporary design that many people are likely to find more attractive (if you prefer whitethe only color option). *At the time of publishing, the price was $399. The Mini typically costs $400, versus $100 for the Levoit. However, it has excellent clean air delivery rate (CADR) certifications from the Association of Home Appliance Manufacturers, which in some ways is a more rigorous measurement. The mechanically identical Coway Airmega 400S, a smart version of the 400, costs a bit more and has a very basic app whose terms of service ask for unnecessarily intrusive permissions. He has conducted laboratory tests for Wirecutters air purifier reviews since 2014. All that said, unless you really need to clean a particularly large space, the quieter, smaller, and more affordable Coway Mighty is usually a better option. This increased the total number of air purifiers weve tested since 2013 to 47on top of the dozens of competitors weve evaluated and dismissed without testing over the years. In our testing, the machines did not match the rapid air cleaning of our current small-space pick, the Levoit Core 300. Finally, the running costs for the Coway Mighty are easily the lowest weve found for a purifier of its abilities. Its crazy to introduce a new pollutant when the goal is to reduce pollution overall. And we know of at least one Wirecutter reader and one Wirecutter staffer who didnt realize they needed to remove the plastic before turning their purifier on, which rendered their purifiers useless. The otherwise identical Winix QS and Winix NK105 add dubious features (a Bluetooth speaker and Wi-Fi connectivity, respectively), and both of those models usually cost more than the Coway. 
And at that speed, the Minis performance on particulate removal tanked: It cut the match smoke by just 63.3% in 30 minutes. Its easy to forget the occasional obligation of replacing your purifiers filtersset a calendar reminder. Instead, it uses washable, electrically charged plates to capture airborne particulates. Delivering exceptional performance in an attractive form, the Blue Pure 311 Auto suffers only from a lack of a display shutoff and higher running costs. On medium, it reduced them by more than 92%. HEPA stands for high-efficiency particulate air. But its not terribly energy efficient: Running it 24/7 on medium consumes about $300 of electricity over five years, and seven new filters in that period cost $180, making this model slightly more expensive than the Coway Mighty over the long term. The DustMagnet machines can also be used as a small side table, because the air blows out of the machine horizontally instead of vertically as on most purifiers. 
The Mighty, on year-old filters, removed 99.6% and 89.2%, respectivelyin line with all our past test results, on new or old filters. Thats a matter of taste and budget, and whether you think the wireless charger adds significant value. Cisno, Airthereal, iTvanila, Secura.
Get reliable, accurate air quality information with these apps and tools. The largest of the particulates, about 0.5 micron and above, are captured via impaction: Unable to change their course due to momentum, they simply slam into the fibers and stick to them. The net result is that virtually all particles get captured quickly, while airflow is only slightly impeded. TruSens, an air-purifier maker that launched in early 2019, made a splash in earning a RedDot Design Award. And no box fan is engineered to withstand the extra workload of driving air through a dense filter, so we cant claim this wont damage the fans motor, and we wouldnt consider it a long-term solution for air-quality issues. We much prefer being able to shut the display off with the machine on the medium setting we recommend (or any other speed that you choose). (The Durabasics filter is approximately inch thinner than the Coway and Cabiclean filters, the only physical difference we found.) And you know what? When retesting our existing air-purifier picks, Tim took four measurements, two using the old filters and two using new filters, to get a picture of how (or even if) their performance changed over time. That 0.3-micron diameter is not arbitrary: The Association of Home Appliance Manufacturers, a trade group, considers that to be the toughest size of particle to remove by physical, HEPA-type filtration. HEPA purifiers also capture many airborne pathogens, including most bacteria and viruses. The 50250-S failed our noise tests, registering more than 50 decibels even on its lowest setting (50 decibels is our limit for what we consider quiet). The 5500-2 also draws more electricity than the Mighty: 13 watts versus 8.1 watts on the medium setting that we recommend for daily use. In short, its cheap, sleekand weak.
The CADR tests measure purifier effectiveness on three different pollutantstobacco smoke, dust, and pollenthat correspond to particles of 0.09 to 1.0 micron, 0.5 to 3.0 microns, and 5.0 to 11.0 microns, respectively, so in a sense they represent a tougher standard. It did okay, cutting the initial particulate load by 87% over 30 minutes on medium. For one, the Winix 5500-2 lacks a display-shutoff feature, which we value highly: The displays of most purifiers are overly bright and can disrupt sleep. Since 2017, Tim Heffernan has conducted multiple real-world tests in New York and Los Angeles, measuring particle concentrations with a TSI AeroTrak 9306, a handheld particle counter commonly used to certify air quality to OSHA standards in factories and other workplaces. In the case of the Coway, our long-duration testing showed that it reduced a very heavy smoke load by 99.9% in less than an hour and then kept it there for a subsequent two hours on medium. Thats very, very clean air. The Core 300 replaces our former budget pick, the Blueair Blue Pure 411, which the Core 300 outperformed considerably. We conducted the same tests on the Molekule Air as we did on the HEPA-filtration competitors, taking baseline readings, burning five matches to create a mass of fine airborne particulates, and then measuring the reduction in those particulates over the course of 30 minutes on all three of the machines speed settings (called Silent, Auto, and Boost, akin to low, medium, and high). As effective as our top pick, the Coway Mighty, but usually a bit more expensive to run, the Levoit Core 400S adds voice control via an app, Amazon Alexa or Google Assistant. First, it pulls a lot of air through its filter each minute. These differences are so small as to be functionally meaningless, and in any case they favor the Airmega 200M. In addition to assessing the objective measures above, we weigh the value each purifier offers, without setting a strict price limit within each room-size category. But now-withdrawn company literature gave us an an idea of its volumetric limits: The company used to claim that the Air provides a full replacement of the air in a 600-square-foot room in under an hour (or every hour per other claims) and in a 150-square-foot room in under 15 minutes. That wording suggested that the Air has a maximum ACH of around 4 in a 150-square-foot room with 8-foot ceilings. Afterwards, we realized we inadvertently tested it with its ionizer function on, and we recommend against ionizers because of their (albeit small) production of ozone. The HEPA filters should have an arrow or other marking indicating the correct orientation. You would use that setting in an extreme and ongoing pollution situation, such as when youre dealing with smoke from a nearby wildfire. The companys sprawling privacy practices cover products ranging from smart scales to foot massagers, which makes it even more difficult to parse, let alone verify. On the medium setting, it reduced the 0.3-micron particulates by a statistically identical 87.7% and 87.6%, on new and old filters, respectively, in 30 minutes. Given its high up-front cost and relatively weak performance, we cant recommend it. But if you have an air-quality emergency on your handsregional wildfires, your charred dinner under the broilerand you have a box fan, tape, the right sort of filter, and no time to buy an air purifier, its worth a shot. However, on its medium-high and high speeds, it produced a persistent rattle that we could not ignore, nor fix by repositioning the machine and making sure that the filter was properly seated. Last, on top of the machines weak performance and high cost, we found the Molekule app persistently laggy. We don't find it worth the money or the security concerns if you're seeking a smart purifier with remote functionality and additional information; check out the Mila instead.
It comes only in dark gray, lacks Wi-Fi connectivity, and uses a one-year VOC filter in contrast to the AM90s three-month filters. This model is also particularly attractive, with a tweedlike, washable cover thats available in several muted colors (it arrives in gray; you can purchase the other colors separately). We then tested them and a genuine Coway filter in the same way as described above, by burning matches and measuring the filters ability to reduce 0.3-micron smoke particles. In February 2020, we tested the Molekule Air Mini in much the same way, in the same 135-square-foot, 1,215-cubic-foot New York office. That said, Im extremely light-sensitive. These findings make the Frnuftig an automatic dismissal under our criteria. It has since received California Air Resources Board certification (meaning it emits no more than 50 parts per billion of ozone), and can be sold in and shipped to California. Generally we test only purifiers with HEPA certification. To sort purifiers into these three categories, we calculate their air changes per hour, or ACH, in hypothetical rooms of 150, 350, and 500 square feet (we assume 8-foot ceilings). Its complicated, but the short answer is yes: HEPA purifiers capture both wildfire smoke and the coronavirus. Our VOC pick has significant amounts of both activated carbon and zeolites. HEPA stands for high-efficiency particulate air and refers to the fact that HEPA filters let air pass through with little resistance while quickly capturing almost all the particles the air is carrying. On the medium setting, it draws just 8.1 watts, so running it 24/7 on that setting consumes just 71 kilowatts annually. Primarily because we know, from past testing, that any highly efficient purifier will drive particle levels down to that level in a short period of time. Tim Heffernan, senior staff writer, tested from 2020 to 2022 (and ongoing). The differences are insignificant in and of themselves, and from our years of testing we know that all the filters would reduce particulate levels to nearly zero over the course of a few hours. But we had originally extrapolated this claim from our past discrete 20-, 30-, or 60-minute test results on each setting, so in 2018 we specifically tested it on the Coway AP-1512HH Mighty and Airmega 400 over the course of three hoursone hour on high, followed by two on mediumafter burning 15 wooden matches to create an initial heavy load of fine smoke particulates. Place them correctly. Setting aside the dubiousness of that claim, even low levels of ozone can be harmful (PDF). Can HEPA air purifiers capture the coronavirus? And we consider subjective factors like the ease of operation and maintenance, the presence or absence of distracting lights (which can disrupt sleep), the user interface, and the physical size and aesthetics. It performed quite well in our testing, capturing 98.2% and 78.5% of smoke particles in half an hour on high and medium, respectively. It adds Wi-Fi capability and a rudimentary app, and it typically costs a few dollars more than the 5500-2. If youre sitting next to someone who has COVID-19, for example, an air purifier on the far side of the room is unlikely to protect you adequately. On its quiet/medium setting, it delivers CADR 231 performance for smoke, pollen, and dustroughly what the Coway AP-1512HH Mighty delivers on high. And the fact that it maintained its high performance even on significantly overused filters gives us confidence in its long-term performance. The HEPA filter, meanwhile, fits snugly into the Mightys frame, sealing tightly against the plastic housing. Five years of electricity, assuming the unit runs 24/7 on speed 3 (medium), adds $165 (at New Yorks high rates). However, its much weaker in its CADR specs than our small-space pick, the Levoit Core 300, and it produced very poor results in our tests, achieving a reduction of particulates of just 58.0% and 59.2% on high and medium, respectively, versus the Levoits 97.4% and 92.6%. Tim placed the machines at the midpoint of the room, approximately 3 feet from the wall and away from any obstacles. Thats not just a financial concernsince air purifiers perform best when cleaning a single room, its worth considering separate machines for, say, the bedroom and the living room. But its more expensive up front and over the course of five years upkeep, and its taller form and higher noise output make it visually and audibly intrusive. And its fussy to maintain, with three small HEPA filters to replace and a prefilter that you have to Velcro in exactly the right placeotherwise it will prevent the cover from reattaching. It also agreed to withdraw its long-standing tagline, Finally, an air purifier that actually works..
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