Airmega 400

Its a little pricey, but we just bought a coway airmega 400 (non smart) and its a best of a unit. I have it set to auto so it can turn off or move a lot of air when ut feels like it needs to. I cant speak about there smart version or integrations tho.

This one hands down https://a.co/d/6vakT6u Coway 400 air mega 

I run two air megas 24/7

Are you looking to move one purifier between your bedroom and living room? I would *not* recommend Airpura or AllerAir unless you have a serious gas/vapor/odor/VOCs issue that can't be mitigated with source control or ventilation. In that case, you'd choose one of their heavyweight carbon purifiers. Airpura and AllerAir do make more particulates-focused units, but they don't list particulate Clean Air Delivery Rates (CADRs). They're also known for be very loud. Both are Canadian companies that manufacture largely in Canada and some components in the USA. Levoit is lower quality than IQAir and Coway. The [IQAir Atem X](https://www.iqair.com/us/products/air-purifiers/atem-x) you linked in a comment is high quality and has CADRs in the 400s CFM, but it's very expensive per CADR. As for "True" HEPA, I would say that listing the standard and filtration efficiency at Most Penetrating Particle Size (MPPS) gives you the best idea of performance. There are several HEPA standards. But I don't think there's a significant difference between brands on this front; they will still clean your air. The [Coway Airmega AP-1512HH Mighty](https://cowaymega.com/products/mighty-ap-1512hh) you linked is commonly recommended. It's a good price point and attainable for many. But the Mighty has a few drawbacks like being less energy efficient, somewhat loud, and occasionally people have reported balance issues (e.g., purifier "walking" across a floor). The [Coway Airmega 400](https://cowaymega.com/products/airmega-400) was probably recommended in part because it's "oversized" for your bedroom. Oversizing allows you to run the unit on a quieter setting while hopefully maintaining CADRs. ➡️ If you're expecting one purifier to clean both the living room and bedroom areas, I would also recommend the Coway Airmega 400. The highly upgraded pick would be the [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox). Top Smoke CADR is 568 CFM. It has wheels so you can move it around easily and it shows PM10, PM2.5, and PM1.0 concentrations. Obviously the ProX is fairly big. Keep in mind that CADRs apply to the highest airflow speed/setting *only*. Lower settings have lower CADRs, which reduces cleaning effectiveness. Right now there aren't any fantastic sales directly from Coway. But you can use the discount codes **COWAYMEGA10** or **FORYOU10** for 10% off most items.

Not sure where you're seeing the [Coway Airmega 400](https://cowaymega.com/products/airmega-400) CADRs, but I included the Coway product page link in my last comment and now this one. As taken from that page, CADRs are: * Dust: 328 CFM * Pollen: 400 CFM * Smoke: 328 CFM The [Airmega AP-1512HH Mighty](https://cowaymega.com/products/mighty-ap-1512hh) uses the "Vital Ionizer", a bipolar ion generator. Turning it off may affect one or more particulate type CADRs. And if the highest setting is too loud, you'd have to use a lower one... the second highest one would probably give you adequate CADRs. If you didn't want to spend that much on the Airmega 400, you could also consider the [Coway Airmega 240](https://cowaymega.com/products/airmega-240) for your bedroom \[240 is sold out at Coway currently, but still [available from Sylvane.com](https://www.sylvane.com/products/coway-airmega-240-hepa-air-purifier)\*\]. There's a discount code at the moment for Sylvane that gives random discounts - **SPOOKY**. As for third party filters, it's a gamble in terms of like-for-like performance. They may void your warranty. I don't know anything about Cabiclean filters.

Most common air purifier brands do not have very much activated carbon or another sorbent media by weight for gases, vapors, or odors (including VOCs). Therefore the activated carbon could become saturated way faster than the HEPA filter. Do you have elevated concentrations of VOCs? If you wanted to know the gaseous species present, you'd need air testing with Gas Chromatography-Mass Spectrometry (GC-MS) analysis. Even then, I would definitely focus on source control and ventilation (e.g., installing and configuring a Energy Recovery Ventilator or Heat Recovery Ventilator) first. This is because heavyweight sorbent media purifiers are very expensive, very loud, and clean the air more slowly than particulates-focused air purifiers due to the need for ["dwell time"/"residence time"](https://www.airscience.com/carbon-filters). Example brands are Airpura and AllerAir. Another issue is that plain/chemically untreated sorbent media do not have high removal capacities for all gaseous species. We've had reports of odors emanating from activated carbon (sometimes "sweet" smelling, which could be not-well-adsorbed acetaldehyde) or spikes on tVOC monitors despite a reduction in odors. **Particulates Purifier** NB: unfortunately air purifiers aren't good at reducing *visible* dust. It's large and heavy in comparison to "invisible" pollutants like PM10, PM2.5, and PM0.1. Therefore it tends to fall and settle on surfaces unless very close to a purifier's intake. Additionally, see the [sticky post at the top of this subreddit](https://www.reddit.com/r/AirPurifiers/comments/1jxgjwf/sticky_purifiers_and_dust_reduction/). You'll need to consider sound levels too. This is covered under the header ["Regarding Infants and Young Children"](https://www.reddit.com/r/AirPurifiers/wiki/index/how_to_choose_an_air_purifier_for_particulates/#wiki_regarding_infants_and_young_children) in our "How To Choose An Air Purifier for Particulates \[Comprehensive Guide\]". I would tend to recommend the [Coway Airmega 400](https://cowaymega.ca/products/airmega-400). You can run it on the second-highest airflow speed which should still give you very good CADRs. If you buy directly from Coway, use the discount code **COWAYMEGA10** for an additional 10% off. This should bring the cost down to $530.15 CAD.

While there are salient points about air pollution and indoor air quality, Jaspr is not good considering the price: $1,199 USD for Clean Air Delivery Rates (CADRs) in the mid-300s CFM. By comparison, you can get a [Coway Airmega 400](https://cowaymega.com/products/airmega-400) with CADRs from 328 CFM - 400 CFM for $366 USD currently. [I went back and forth with the founder about their spurious claims](https://www.reddit.com/r/AirPurifiers/comments/1gspgqd/comment/lxg2uxz/) (warning: very long). He used to run a marketing company which explains Jaspr's propensity for slanting the truth.

No, one [Winix C610](https://www.winixamerica.com/product/c610/) wouldn't be enough. The [Winix 5510](https://www.winixamerica.com/product/5510/) would be underpowered too. I would base my choice off of Clean Air Delivery Rates (CADRs), not Air Changes per Hour (ACH). See the AutoModerator comment about the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/). For an open 500 sq. ft. space, *minimum* Clean Air Delivery Rates (CADRs) should be **334 CFM**. This assumes the ceiling height is 8 feet. The Winix C610 has CADRs of: * Dust: 252 CFM * Pollen: 262 CFM * Tobacco Smoke: 248 CFM If you want a conventional HEPA purifier, it's going to be hard to find one unit that isn't very expensive and large. A model that is slightly short on dust and smoke CADRs is the [Coway Airmega 400](https://cowaymega.com/products/airmega-400). (The [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox) exceeds min. CADRs, but it's large and very expensive.) The [Alen BreatheSmart 75i product page](https://alen.com/products/alen-breathesmart-75i-air-purifier?variant=13172054491203) claims an averaged (?) CADR of 375 CFM with a big price tag of $799. This is probably using the "Pure" Allergen Collector filter. [Energy Star says the BreatheSmart 75i (version 2.0)](https://www.energystar.gov/productfinder/product/certified-room-air-cleaners/details/3417462) has CADRs of: * Dust: 351 CFM * Pollen: 431 CFM\* * Smoke: 370 CFM \*Likely with the ionizer turned on. Turning the ionizer off will probably decrease Pollen CADR. Alternatively, you can buy multiple smaller purifiers whose combined CADRs meet or exceed the minimum 334 CFM values. Just remember that CADRs for purifiers are for the highest airflow speed/setting only. Lower settings have lower CADRs.

So the issue is that most common purifier brands have little sorbent media (such as activated carbon) for odors. This includes Coway, Levoit, Winix, Medify Air, Smart Air, Honeywell, Blueair, etc. Instead, they are designed to capture particulates. Musty and old odors may be caused by high relative humidity (RH) and/or high carbon dioxide levels. For high RH, you need a dehumidifier. For CO₂ levels, you need "fresh" (oxygenated) air ventilation. This can be achieved via open windows or installing an Energy Recovery Ventilator (ERV) / Heat Recovery Ventilator (HRV). It's important to control relative humidity for reasons beyond mold prevention. With a heavyweight sorbent media purifier, certain sorbents can adsorb water vapor from the air. This would likely shorten the filter's working life. As for a purifier that captures particulates for allergies, it really depends on your budget. Oversizing allows you to run a purifier at a lower airflow speed while maintaining CADRs. The issue is that vast majority of brands list CADRs only for the highest airflow speed/setting. **Particulates Purifiers:** I would tend to recommend the [Coway Airmega 400](https://cowaymega.com/products/airmega-400). Unfortunately the sale price ($366) ended for this model yesterday and it's back up to its full price of $649. If you can hold out, you may want to wait for another sale. [Amazon is cheaper right now for the Airmega 400 in Graphite ($399)](https://www.amazon.com/Coway-Airmega-Purifier-sq-ft-White/dp/B0722YZ1R1/?th=1). You could also opt for two purifiers, such as two [Coway Airmega 240](https://cowaymega.com/products/airmega-240) units. And if you want to order directly from Coway, use the discount codes **COWAYMEGA 10** or **FORYOU10** for 10% off. **Gases/Vapors/Odors:** Heavyweight sorbent media purifiers are very loud, very expensive, and clean the air more slowly than particulates-focused air purifiers due to the need for "dwell time"/"residence time" + thick media beds. Example brands are Airpura and AllerAir. A more entry-level unit from AllerAir would be around $600. To boot, most Airpura and AllerAir standard activated carbon options are plain/chemically untreated. Plain/chemically untreated carbon and other sorbents do not have high removal capacities for all gaseous "species". Some people report "sweet" odors emanating from the carbon beds, which may be the not-well-adsorbed acetaldehyde. Other times there are spikes on tVOC monitors despite a reduction in odors. In order to increase removal efficiencies, you need to impregnate activated carbon or another sorbent, usually called impregnation or wet-mixing. Potassium permanganate (KMnO₄) appears to be a more common impregnant. It operates in part by breaking down certain gases via redox reactions. Problematic byproducts may be generated depending on your air chemistry, although this is usually more of a concern in totally unknown/high complex air chemistries. KMnO₄ also has a tendency to off gas as it saturates or loses efficacy. If you want to experiment with something cheaper, you could have a look at the [Oransi TrueCarbon 150C](https://oransi.com/products/truecarbon-150c-air-purifier). It uses 3.2 lbs. of KMnO₄ impregnated activated carbon. Keep in mind this isn't very much of a sorbent medium by weight.

There are some Black Friday \[BF\] deals already, but I think there may be more to come in the week leading up to Thanksgiving or BF. I would generally recommend **Coway** first. They're one of the highest quality consumer-grade brands. I think their larger and more powerful models may not be discounted yet. * Four bedrooms, 1,400 cubic feet: [Coway Airmega 250](https://cowaymega.com/products/airmega-250) \[discounted\] or [Coway Airmega 240](https://cowaymega.com/products/airmega-240) \[currently out of stock from Coway\]. * Master Bedroom: [Coway Airmega 250](https://cowaymega.com/products/airmega-250) or [Coway Airmega 400](https://cowaymega.com/products/airmega-400) \[full price; likely will be discounted closer to BF\] * Living Room, \~2,160 cu. ft.: [Coway Airmega 250](https://cowaymega.com/products/airmega-250) or [Coway Airmega 400](https://cowaymega.com/products/airmega-400) * Open Space, \~12,600 cu. ft.: no single purifier will cover this space. You would need *two* [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox) units to meet AHAM 2/3 rule minimum CADRs of 1,050 CFM. Obviously nowhere close to your budget anyways, but don't buy the [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox) at full price ($999). It could drop to $619 - $649. For the open space, you may want to consider large DIY Corsi-Rosenthal boxes with [MERV](https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating) 13/14 furnace filters and PC fans. We generally recommend the [3M Filtrete MPR 1900 MERV 13](https://www.filtrete.com/3M/en_US/p/d/b00039899/) (1-inch deep) filters for C-R boxes. A guide is here: [https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=a61b9774d0dd](https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=a61b9774d0dd) A less DIY approach would be to buy several [AirFanta 3Pro](https://air-fanta.com/products/airfanta-3pro) units. It uses Efficient Particulate Air (EPA) E11 filters. Top composite CADR for the CARB-certified edition is 413 CFM.

Yes. The Coway Airmega 400 sometimes drops in price enough to justify purchasing instead. Last year in the run up to Black Friday, the Airmega 400 was $349. In 2024, I also saw the price around $369 occasionally. Right now, the Airmega 400 is full price. This usually happens before a significant sale. Some discount codes may still work with sale prices too. These are **COWAYMEGA10** and **FORYOU10** for 10% off. Performance-wise, there's an appreciable difference between the Airmega 300 and Airmega 400 for the top Smoke and Pollen CADRs.

Because your ceilings are higher than 8 ft., we need to calculate by volume first and then divide by 8 for the "adjusted" purifier coverage rating. The bedroom has an adjusted purifier coverage rating of 437.5 sq. ft. Minimum CADRs would be 292 CFM. Not sure how big your living room is, as you didn't list its dimensions. Let's just say it's 450 sq. ft. with a 10 ft. ceiling. Adjusted purifier coverage rating is 562.5 sq. ft. Minimum CADRs needed are 375 CFM. I normally recommend Coway. The bigger units ([Coway Airmega 400](https://cowaymega.com/products/airmega-400) and [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox)) are currently not on sale directly from Coway. And I definitely *don't* recommend buying either model at full price. Both the [Airmega 400](https://www.sylvane.com/products/coway-airmega-400-air-purifier) and [Airmega ProX](https://www.sylvane.com/products/coway-airmega-pro-x-large-space-air-purifier) are cheaper at Sylvane for the moment. **Alternatives** * Bedroom: [Levoit EverestAir-P](https://us.vesync.com/product-detail/levoit-everestair-p-smart-air-purifier-525) (from the VeSync Store) * Living Room: [Levoit EverestAir-P](https://us.vesync.com/product-detail/levoit-everestair-p-smart-air-purifier-525) \+ [Levoit Vital 200S-P](https://us.vesync.com/product-detail/levoit-vital-200s-p-smart-air-purifier-560) The EverestAir-P has a top Smoke CADR of 354 CFM. So if your living room is roughly the equivalent of 562.5 sq. ft. or larger, you would need the Vital 200S-P to meet minimum CADRs.

Per the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/), a 300 sq. ft. space needs a minimum of 200 CFM Clean Air Delivery Rates (CADRs). Since this is also an office, I assume quiet operation is needed too. Therefore you need to "oversize" a bit so you can run the purifier on a lower setting with adequate CADRs. I tend to recommend Coway as it's a high quality consumer-grade brand. The [Coway Airmega 400](https://cowaymega.com/products/airmega-400) should be a very good fit. Right now, the Airmega 400 is full price at Coway. I wouldn't buy it right now, as Coway's sales are frequent enough; last year, the Black Friday price was $349.) You may also want to check Sylvane and Amazon for deals. If you decide to buy from Coway, try using discount codes **COWAYMEGA10** or **FORYOU10** for 10% off. These are the standard e-mail sign-up codes. Keep in mind the CADRs listed for purifiers apply to the highest speed/setting only. Lower settings have lower CADRs which reduces cleaning effectiveness.

Your math is correct. And if you're super sensitive to allergens, we often recommend even higher CADRs. Of course if you had pristine air, there would be no need for a purifier. Normally I would suggest the [Coway Airmega 400](https://cowaymega.com/products/airmega-400), but certainly **not** at its current full price. Coway's sales happen frequently enough - 2024's Black Friday saw the price drop to $349. And normally the full price doesn't stick around for long anyways. The [Coway Airmega 350](https://cowaymega.com/products/airmega-350) is definitely better value for CADRs, more energy efficient, and has a cheaper filter. However, it does have an integrated pre-filter and a shorter warranty period than the Airmega 400. I don't know how the two models compare in terms of sound levels. If you need something right away, you could build one large or multiple Corsi-Rosenthal boxes with [MERV](https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating) 13/14 furnace filters and PC fans. CADRS will depend upon airflow speed, # of PC fans, # of filters, and filter size. You may want to add a fine mesh pre-filter to prevent coarse particulates from clogging the MERV filters. A guide: [https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c](https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c) Another solution may be the [AirFanta 3Pro](https://air-fanta.com/products/airfanta-3pro). It uses Efficient Particulate Air (EPA) E11 filters, which is two filter classes below HEPA H13. Top composite CADR is 413 CFM for the CARB-certified edition. Drawback: it does not have a fine mesh pre-filter, but rather metal grating. The Black Friday deal means 10% off, so the 3Pro is currently $144.00.

Purifiers aren't good at reducing *visible* dust and pet hair. Both are large and heavy compared to "invisible" pollutants like PM10, PM2.5, and PM0.1. [AHAM's 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/) recommends CADRs be *at least* 2/3 of your room's area (assuming an 8 ft. ceiling). However, people with allergies or asthma should aim for even higher CADRs. Your "adjusted" square footage based on cubic volume is 229 sq. ft. Minimum CADRs would be 153 CFM, I would increase this to 250 CFM or so. Neither model uses an ionizer. The [Coway Airmega 350](https://cowaymega.ca/products/airmega-350) has higher top CADRs and is more energy efficient (watt per CADR) than the Airmega 400. The [Airmega 400](https://cowaymega.ca/products/airmega-400) has a [longer warranty](https://cowaymega.ca/pages/warranty-registration) (5 years), separate permanent pre-filters, and may be somewhat quieter than the Airmega 350. The Airmega 350's "Fresh Starter" filter will likely be cheaper than the Airmega 400's filter set. There may be two alternative replacement filters for the Airmega 350 as well. In the USA, the Airmega 350's "Fresh Starter" filter is $79.00 USD at full price. The Airmega 350 seems to have good reviews thus far, but it was released earlier this year in Canada. The Airmega 400 has a great track record which is why it's recommended frequently here. I would lean toward the Airmega 400. But the Airmega 350 should be very good too.

Is the $400 a grand total for all purifiers? If so, that's very low given the room sizes. Use the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/) for minimum CADRs as listed in the AutoModerator comment. * A 400 sq. ft. living room needs minimum CADRs of 267 CFM. * The 200 sq. ft. dining room plus hallway requires min. CADRs of 134 CFM. * The 350 sq. ft. bedroom needs min. CADRs of 234 CFM. These CADRs should be even higher if you're dealing with mold spores or other allergies. Coway is a high quality consumer-grade brand and usually our first recommendation. * Living Room = [Coway Airmega 400](https://cowaymega.com/products/airmega-400) * Dining Room + Hallway = [Coway Airmega 240](https://cowaymega.com/products/airmega-240) * Bedroom: [Coway Airmega 400](https://cowaymega.com/products/airmega-400) Unfortunately the Airmega 400 is full price (I would always wait for a sale or shop around until it's down to $400 or less) and the Airmega 240 is currently out of stock. **Alternative conventional purifiers** Levoit is considered good value but lower quality than Coway. You could choose the [Levoit EverestAir-P](https://us.vesync.com/product-detail/levoit-everestair-p-smart-air-purifier-for-home-large-room-525) each for the Living Room and Bedroom. The Dining Room + Hallway could be covered by a [Levoit Vital 200S-P](https://us.vesync.com/product-detail/levoit-vital-200s-p-smart-air-purifier-560). You may want to buy from the VeSync Store where you'll see coupon codes on product pages. **Corsi-Rosenthal boxes or similar** Lower single pass filtration efficiency, but can have higher CADRs. You could build large Corsi-Rosenthal boxes with [MERV](https://www.epa.gov/indoor-air-quality-iaq/what-merv-rating) 13/14 furnace filters and PC fans. PC fans are much quieter than box fans. CADRs depend upon airflow speed, # of fans, # of filters, and filter size. A guide: [https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=c696869dfc85](https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c?gi=c696869dfc85) For less assembly.... consider an [AirFanta 3Pro](https://air-fanta.com/products/airfanta-3pro) for each room or area. The 3Pro uses Efficient Particulate Air (EPA) E11 filters, which is two filter classes below HEPA H13. Top composite CADR is 413 CFM.

Yep, they're definitely expensive. And I recommend the [Airmega 400](https://cowaymega.com/products/airmega-400) only when discounted (e.g., $349 - $450), but it's been full price through Black Friday *and* Christmas 2025 annoyingly. \*[Coway Airmega 400S in White is $577 right now](https://cowaymega.com/products/airmega-400s?variant=33436459892871), but IMO smart capabilities aren't worth the extra money.

Blueair models often have high CADRs for less money. However, they use an always-on ionizer to enhance the mechanical filter's efficiency. Some people don't like ionizers as they *could* alter air chemistry or induce negative health effects. That being said, Blueair is certified for extremely low ozone emissions. The [RabbitAir MinusA2](https://www.rabbitair.com/products/minusa2-air-purifier) has a top Smoke CADR of 180 CFM. Warranty is 5 years. Depending on whether you want Wi-Fi or not, the price is $619.95 or $599.95. Certain decorative front cover options add another $20. The largest room size the MinusA2 could handle would be 270 sq. ft. with an 8 ft. ceiling. This is based on the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/). For wildfire smoke, the largest room size shrinks to 180 sq. ft. with an 8 ft. ceiling. Currently, you can buy the [Coway Airmega 400S in White for $577](https://cowaymega.com/products/airmega-400s?variant=33436459892871). This model with an "S" has Wi-Fi capability. Top Smoke CADR is 328 CFM. Warranty is 5 years. I usually prefer the [Coway Airmega 400](https://cowaymega.com/products/airmega-400) when it's on sale (e.g., $349-$480). Hasn't been discounted in a while... not sure why. IMO the higher end Coway models are much better value for money.

Hello! Is this the U.S. EPA's AQI? IQAir generally uses the U.S. AQI for their world air quality map. Each country or region may have its own AQI which assigns different concentration break points to a range of values. PM2.5 is normally given in µg/m^(3). **Purifiers are usually sized by each room or space. So it would be very helpful to have the dimensions of bedrooms, living rooms, etc.** Most Dyson devices with air purification functions are very poor at cleaning the air. A Coway Airmega 150 is meant for small rooms only. Its top Smoke CADR is 153 CFM. Two Airmega 150 purifiers running at top speed would have a combined top Smoke CADR of 306 CFM. The Levoit Core 600S has a top Smoke CADR of 391 CFM, so it's much more powerful than a single Airmega 150. Keep in mind the CADRs I'm listing apply to the highest airflow speed/setting only. Lower settings have lower CADRs which reduces cleaning effectiveness. I'm not a huge fan of Blueair because of the always-on ionizer. For PM2.5, I tend to recommend strictly mechanical filters. Coway is generally a higher quality brand than Levoit, but you have to buy according to room dimensions and consider particulate matter concentrations. Coway tends to be more expensive, both for the initial purchase and replacement filters. Something more powerful would be the Coway Airmega 400 with a top Smoke CADR of 328 CFM. You may also want to consider Philips as they have high CADR units like the PureProtect 3200 and PureProtect 4200 series models. I don't know if they're sold in the UAE.

See **Rule 4: Information For Air Purifier Requests**. We'd need your room's dimensions, pollutants you want to remove, and budget. I assume you want to remove particulates primarily. For most small to medium rooms, the [Winix C909 at Costco](https://www.costco.com/p/-/winix-c909-4-stage-air-purifier-with-wi-fi-plasmawave-technology/100842491) is very good value.\* It's fairly loud on the highest setting (60 dBA according to the Decibel X Android app) and not terribly energy efficient (95 W max). Coway is one of the best best quality consumer-grade brands but more expensive for the purifier and replacement filters. The [Coway Airmega 400 (on sale in Graphite)](https://cowaymega.com/products/airmega-400?variant=33436456976519) is excellent. \*Winix uses PlasmaWave, an optional bipolar ionizer. Keep it *off* if there are birds present as it could harm or kill them. (NB: PlasmaWave defaults to being enabled after a power off/power on cycle.)

What are you and u/BatFull9947 talking about? 😂 For particulates, I've recommended loads of purifiers that are nowhere near $1,000. And if they tend to be expensive, I tell people to *not* pay full price. E.g., the [Coway Airmega 400](https://cowaymega.com/products/airmega-400?variant=33436457009287) ($649 to $349) and the [Coway Airmega ProX](https://cowaymega.com/products/airmega-prox?variant=45657065718014) ($999 to $649), both of which happen to be discounted heavily at the moment. Can't remember how many times I've suggested $200-and-under units like the [Winix C909 at Costco](https://www.costco.com/p/-/winix-c909-4-stage-air-purifier-with-wi-fi-plasmawave-technology/100842491) and [Levoit Vital 200S-P](https://levoit.com/products/vital-200s-p-smart-air-purifier). Or DIY Corsi-Rosenthal boxes for people on lower budgets. If had a "more money = best" mindset, we'd be plugging junk like Dyson.

The [Winix C909\* at Costco](https://www.costco.com/p/-/winix-c909-4-stage-air-purifier-with-wi-fi-plasmawave-technology/100842491) is $199.99 and has a top Smoke CADR of 323 CFM. This is higher than the Rabbit Air A3's top Smoke CADR of 257 CFM. \*Has PlasmaWave, an optional bipolar ionizer. Keep this off if birds are present as it could harm or kill them. (NB: PlasmaWave defaults to being enabled after a power off/power on cycle.) You can buy the C909's [Filter A replacement set at The Home Depot](https://www.homedepot.com/p/Winix-True-HEPA-4-Filter-Activated-Carbon-Replacement-Filter-A-115115/202034412) for $32.21 currently. Winix's warranty is 2 years and Rabbit Air's warranty is 5 years, so I think Rabbit Air probably has better build quality. Winix is more of a mid-grade brand, uses 95 W max, and is somewhat loud on the highest airflow setting called "Turbo" (60 dBA according to the Decibel X Android app). Something more comparable to Rabbit Air's warranty and quality would be the [Coway Airmega 400 (currently on sale in Graphite)](https://cowaymega.com/products/airmega-400?variant=33436456976519). Top Smoke CADR is 328 CFM and it has a 5 year warranty. Replacement filter sets will be more expensive; you can buy directly from Coway or Sylvane.

Sorry for the late reply here. Unfortunately purifiers aren't good at reducing *visible* dust. It's large and heavy compared to "invisible" pollutants like PM10, PM2.5, and PM0.1. See our other subreddit resources on dust: * [I need an air purifier for dust. What should I buy?](https://www.reddit.com/r/AirPurifiers/wiki/index/faqs/#wiki_i_need_an_air_purifier_for_dust.__what_should_i_buy.3F) * [Why is there visible dust despite running an air purifier?](https://www.reddit.com/r/AirPurifiers/wiki/index/faqs/#wiki_why_is_there_visible_dust_despite_running_an_air_purifier.3F) * [What else can I do to reduce dust?](https://www.reddit.com/r/AirPurifiers/wiki/index/faqs/#wiki_what_else_can_i_do_to_reduce_dust.3F) (⬅️ Try as many of these strategies as possible) Purifiers are better for dander. Use the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/) for minimum Clean Air Delivery Rates (CADRs). If you have two rooms at 10.5 ft. x 13.5 ft. x 9 ft., total volume is 2,551.5 cubic feet. Divide this by 8 ft. to get 319 sq. ft. And then divide by 1.5 for minimum CADRs of 213 CFM. Normally I would recommend something like the [**Coway Airmega 400**](https://cowaymega.com/products/airmega-400). But right now it's full price which usually doesn't last. Last year in the run up to Black Friday, the Airmega 400 was $349. There may be sale prices in December too. You might be able to apply a discount code on top of sale pricing; Coway's e-mail signup codes for 10% off are **COWAYMEGA10** or **FORYOU10**. If you need something much sooner, have a look at the [**Winix C909 at Costco**](https://www.costco.com/p/-/winix-c909-4-stage-air-purifier-with-wi-fi-plasmawave-technology/100842491). Winix is more of a mid-grade brand, with some reports of whining, whirring, or clicking noises after the 2 year mark. This is usually an issue with bad motor bearings. The C909 is somewhat loud on the highest airflow setting ("Turbo") at 60 dBA according to the Decibel X Android app. And it's not terribly energy efficient (at 95 W). But its replacement filters are cheap at [The Home Depot](https://www.homedepot.com/p/Winix-True-HEPA-4-Filter-Activated-Carbon-Replacement-Filter-A-115115/202034412). Keep in mind the CADRs listed apply to the highest airflow speed/setting only. Lower settings have lower CADRs, which reduces cleaning effectiveness.

We tend to recommend Coway first because of the high quality. The Airmega 400 is full price at Coway right now and I do not recommend buying it until it's dropped to $400 or less. * Bedroom: 187.5 sq. ft.; [Coway Airmega 240](https://cowaymega.com/products/airmega-240) * Living Room: 281.25 sq. ft.; [Coway Airmega 400](https://cowaymega.com/products/airmega-400)\* * Basement: 375 sq. ft.; [Coway Airmega 400](https://cowaymega.com/products/airmega-400)\* * Car: few good choices sadly. The IQAir Atem Car is super expensive and would be loud. \*Sylvane has the [Coway Airmega 400 in Graphite](https://www.sylvane.com/products/coway-airmega-400-air-purifier?variant=42340187734102) for $454.99; use the discount code **THANKS25** and it drops to $409.50. For all three rooms except for the car, a cheaper alternative would be the [Winix C909 as sold at Costco](https://www.costco.com/p/-/winix-c909-4-stage-air-purifier-with-wi-fi-plasmawave-technology/100842491). Winix is more a mid-grade brand and quite loud on the highest airflow setting called "Turbo" (60 dBA according to Decibel X Android app). You may want to keep PlasmaWave off as it's a bipolar ionizer. **Important**: [infants and young children should not be exposed to overly loud air purifiers](https://www.reddit.com/r/AirPurifiers/wiki/index/how_to_choose_an_air_purifier_for_particulates/#wiki_regarding_infants_and_young_children). According to a *Pediatrics* article, USA hospital nurseries have recommended sound level limits of 50 dBA. # VOCs If you have concerns about particulates *and* VOCs, you generally need two types of air purifier. Most common and cheaper purifier brands have very little activated carbon or other sorbent media by weight. They are designed for particulates capture. Mitigating VOCs via purifiers is usually difficult and expensive. We always recommend source control and ventilation first. It would be super helpful to know the VOC "species" and concentrations present in your air. This requires air testing with Gas Chromatography–Mass Spectrometry (GC-MS) analysis. Why? Plain or chemically untreated sorbents do *not* have high removal efficiencies for all gaseous species. This can lead to spikes on tVOC monitors and sometimes a "sweet" smell emanating from the purifier (possibly the not-well-adsorbed acetaldehyde). There are also issues with competitive adsorption between different gaseous species. Having air testing done allows you to tailor sorbent media to reduce the likelihood of unwanted effects. Heavyweight sorbent media purifiers are very expensive, very loud, and clean the air slowly. Because these units contain so much sorbent media by weight, there's much less room for mechanical filters (for particulates) and lowered "delivered" airflows.

Hi, I created the newest iteration of the Buying Guide. I didn't include the [Coway Airmega 300](https://cowaymega.com/products/airmega-300) because in the past, the [Coway Airmega 400](https://cowaymega.com/products/airmega-400) would be discounted frequently enough to justify its purchase instead. Annoyingly, there were no good Black Friday or Christmas sales for the [Airmega 400](https://cowaymega.com/products/airmega-400) or [Airmega ProX](https://cowaymega.com/products/airmega-prox) in 2025. Coway seems to have quite a few models out of stock and I'm unsure why. I'm hoping there will be discounts soon... In terms of moving the unit around, the ProX has wheels. It's also highly energy efficient per CADR. And it has some of the highest CADRs around. Only the [Medify Air MA-112](https://medifyair.com/products/ma-112?variant=31240021180483) and [Medify Air MA-112 PRO](https://medifyair.com/products/ma-112-pro-air-purifier-white?variant=42313765486659) beat it, but these are much louder and less energy efficient. [Sylvane has a somewhat better price right now](https://www.sylvane.com/products/coway-airmega-pro-x-large-space-air-purifier). I have a [Winix C909](https://www.winixamerica.com/product/c909/) from Costco in a \~175 sq. ft. room; very oversized for the space. The top airflow setting called "Turbo" is 60 dBA according to the Decibel X Android app, so it's quite loud (note that I didn't use a professional sound meter). I like it very much. As for app control, I've never used it. Since the C909 will be very underpowered for the overall square footage, I would always run it on the highest airflow speed / setting whose noise levels you can tolerate. We'll see about the lawsuit re: Winix. It could be that the HEPA filters aren't meeting the requisite efficiency and/or too much dirty air bypasses the HEPA filter. There are no gaskets or seals on Winix's HEPA filters. Coway's Airmega 400(S) and Airmega ProX will be better build quality and likely last longer with fewer issues than Winix. Some Winix units develop bad motor bearings after the 2 year mark. **I would hold out for as long as possible and keep a close eye on Airmega 400 and Airmega ProX prices until spring approaches.** I almost never recommend either model at full price from Coway.

Air purifiers aren't very good at reducing visible dust because it's relatively large and heavy. You'd have to hugely oversize a conventional HEPA purifier to capture more visible dust, which your budget would support. Whether you feel this is worth doing is another matter... You should be looking at Clean Air Delivery Rates (CADRs). Bare minimum CADRs ought to be 134 CFM. If you need to filter wildfire smoke, Smoke CADR should equal your room's area (assuming an 8 ft. ceiling), so 200 CFM for a 200 sq. ft. room with an 8 ft. ceiling. Keep in mind that CADRs listed by most brands are for the highest airflow speed/setting only. Lower settings will have lower CADRs. If you wanted something somewhat oversized to help with dust, consider the [Coway Airmega 400](https://cowaymega.com/products/airmega-400). Filter replacements can be found on [Amazon](https://www.amazon.com/AIRMEGA-Purifier-Replacement-Filter-400S/dp/B01C9RIAE4/ref=sr_1_5), [Sylvane](https://www.sylvane.com/coway-airmega-400-series-max2-filter-set.html), or [directly from Coway](https://cowaymega.com/products/airmega-400-max2-filter-set?variant=33436452323463). It's one of the best quality consumer-grade purifier brands. The Airmega 400 is quite expensive right now. Coway's prices change very frequently, so you may want to check back daily. If you want to buy directly from them, use the codes **FORYOU10** or **COWAYMEGA10** for 10% off even on discounted purifier models (most of the time). As for other brands: I would nix Winix and Levoit. Winix is more mid-grade quality and known for louder units. The Smart Air Blast MKII is very powerful and the quietest unit on the market (AFAIK). But it's an energy hog and not available for purchase due to the tariff situation. Alen is a good choice, although their units are expensive up front. E.g., the [BreatheSmart 75i](https://alen.com/products/alen-breathesmart-75i-air-purifier?variant=13172054491203) has a particulate CADR of 375 CFM (for the "Pure" filter only) and costs $799. The other filters with sorbent media will lower CADR due to more restricted air flow. It is very energy efficient for the CADR at 55 W. As for the ["Forever Guarantee"](https://alen.com/pages/alen-forever-guarantee), you are required to register the purifier and maintain an active air filter subscription **or** proof of filter purchase(s) every 12 months. For the BreatheSmart 75i, you need to purchase a filter every 15 months or sooner.

No, Dyson is one of the worst! The HP09 has terrible Clean Air Delivery Rates (CADRs). They just know how to market effectively. As **Rule 4** and the AutoModerator comment repeats, it's helpful to know the ceiling height. I'll assume it's 2.4 meters. 60 m^(2) x 2.4 = 144 m^(3). For rooms measured in meters, CADR should be at least 3 times a room's volume (in m^(3)). So the minimum CADR should be 432 m^(3)/h. If you have [allergies, health conditions, high pollution, etc.](https://www.reddit.com/r/AirPurifiers/wiki/index/how_to_choose_an_air_purifier_for_particulates/#wiki_when_higher_than_normal_cadrs_may_be_needed), multiply the room's volume by 4-6. So CADRs of 576 - 864 m^(3)/h. Coway is a high quality brand that's relatively quiet. I don't know exactly where you are, so I don't know what's available to you. But the [Coway Airmega 400](https://www.amazon.co.uk/purifier-restaurant-certified-HyperCaptive-filtration/dp/B099S9Y285) would be a very good fit (Amazon UK website linked). If you can't find that, the Coway Airmega 300 might suffice... although you may want to supplement it with a smaller Coway model like the Coway Airmega Jet.

I wouldn't use ChatGPT or another AI tool to find a purifier. It's frequently wrong about specifications or other details. And I wouldn't recommend Dyson. Their units provide poor particulates cleaning for the money. Per **Rule 4: Information For Air Purifier Requests**, I don't know your country of residence or your budget. I'm guessing you're in Saudi Arabia. The acronym you mentioned is CADR (Clean Air Delivery Rate). As u/timesuck said, purifiers aren't good at reducing visible dust particles as they're large and heavy compared to "invisible" pollutants like PM2.5. Vacuuming and dusting are the better solutions for visible dust capture. I would recommend a bagged vacuum with a HEPA exhaust filter from brands like Miele or Sebo if available. Another important matter is sound output. Infants and young children shouldn't be exposed to overly loud purifiers. According to a *Pediatrics* article, USA hospital nurseries have a recommended sound limit of 50 dBA. Because of this, you'll want to oversize a purifier so you have ample CADR without being too loud. For rooms measured in meters, I would select a high CADR. If PM10 and PM2.5 pollution concentrations are high, I would go with a CADR six times the room's volume in m^(3). Let's assume the nursery has a 2.4 meters high ceiling. Room volume is then 72 m^(3). 72 m^(3) × 6 = 432 m^(3)/h CADR. I would tend to recommend the Coway brand first as they're high quality, energy efficient, and relatively quiet. Something like the **Coway Airmega 400** (top CADR: 677 m^(3)/h) would be great. But it's also expensive. A good choice would be the **Philips Smart Air Purifier PureProtect 4200 Series** (top CADR: 600 m^(3)/h). Keep in mind the CADRs listed for these purifiers apply to the highest airflow speed/setting only. Lower settings have lower CADRs which reduces cleaning effectiveness. Lastly, these two purifiers have little capacity for capturing gases, vapors, odors, or VOCs. This is due to very little activated carbon by weight. Unfortunately you need many pounds of activated carbon or other sorbent media. Heavyweight sorbent media purifiers are very loud and very expensive.

It's difficult to buy just one unit that's great at removing particulates (e.g., pollen, dander, soot, smoke particles, small dust particles, etc.) *and* gases/vapors/odors/VOCs. Most particulates purifiers have very little activated carbon or sorbent media by weight. Oppositely, heavyweight sorbent media purifiers clean the air more slowly than particulates-focused units for several reasons. The thick beds leave less room for mechanical filters (the latter meant for particulates). There's also the need for ["dwell time"/"residence time"](https://www.airscience.com/carbon-filters) for optimized gaseous removal. Unfortunately heavyweight sorbent media purifiers are very loud and very expensive. Infants and young children shouldn't be exposed to overly loud units; a *Pediatrics* [article states the recommended sound limit for US hospital nurseries is 50 dBA](https://doi.org/10.1542/peds.2013-3617). To boot, sometimes you need specially modified sorbents depending on the VOC "species" in your air. Plain/chemically untreated sorbents do not have high removal efficiencies for all gaseous species. **For a list of VOCs and their concentrations, air testing with Gas Chromatography-Mass Spectrometry (GC-MS) analysis is required.** An example of a business performing air testing and analysis is [Fike Analytical Technologies, LLC](https://fikeanalytical.com/). Don't know if they work nationwide. This is why we recommend source control and ventilation strategies first for gases or VOCs. Building-wide solutions could be an Energy Recovery Ventilator (ERV) or a Heat Recovery Ventilator (HRV). # Particulates purifiers I think the concern about Coway's Green HEPA media is overblown, but it's your decision of course. If you change your mind, I might go with the Coway Airmega 400. *Don't* buy the 400 at full price; look for prices of $349 - $450. You may want to consider the [Smart Air Blast Mini MKII](https://www.smarterhepa.com/collections/air-purifiers/products/smart-air-blast-mini) or the [Smart Air Blast MKII](https://www.smarterhepa.com/products/smart-air-blast) instead if you want to avoid antimicrobial coatings. The drawbacks: the Blast Mini and full size Blast are not as energy efficient as the Coway Airmega 400. Both Blast models have an optional activated carbon filter, but the weight of carbon is very low for treating VOCs.

If you need to filter particulates (e.g., smoke particles) *and* smoke gases/vapors/odors/VOCs, you really need two types of air purifier. Most common purifier brands have very little activated carbon or other sorbent media by weight. They are designed to capture particulates quickly. You need many pounds of sorbents for longer-term or high concentrations of gases/vapors/odors/VOCs. Heavyweight sorbent media purifiers are very loud, very expensive, and clean the air more slowly than particulates-focused units. This is due to the need for "dwell time"/"residence time" and the thick media beds. If you're in a country outside of the USA and Canada, you have fewer choices for sorbent media purifiers. Usually the only choice would be the IQAir GC or GCX series units, specifically models using potassium permanganate (KMnO₄) impregnated activated alumina. KMnO₄ improves the removal (via redox reaction) of formaldehyde.\* As for VOC or PM2.5 sensors, most consumer-grade purifiers use very cheap and inaccurate ones. I would invest in a standalone AQI monitor like the [PurpleAir](https://www2.purpleair.com/products/list) (Flex or Zen models) or the [AirGradient ONE](https://www.airgradient.com/indoor/). These are more accurate. Of the brands & models you listed, the Coway Airmega 200M would likely be best. I'm unsure if other Coway models are offered, but I would more strongly recommend the Coway Airmega 240, Coway Airmega 250, or Coway Airmega 400 if they are available to you. \*As an oxidizer, KMnO₄ has the potential to produce problematic byproducts depending on the gases in the air. This is usually an issue with highly complex or unknown air chemistries (fires in the built environment or chemical spills).

https://preview.redd.it/eg2z5elc25sf1.png?width=333&format=png&auto=webp&s=a0a52b370fe0c79399923b0d9eb4eefd01d71503 The screenshot shows the PM2.5 count in my balcony vs the PM 2.5 count in my living room with the air purifier on (Coway 400). When I turn the purifier off, the indoor reading goes back up to match the balcony level. So the purifier is clearly making a big difference.

Yup, we splurged on a couple coway airmega 400 purifiers when we were living in Seattle and are glad we brought them with us to Minneapolis since we bought an older craftsman home without a duct AC system (which typically allow air filters). This past week would have been really rough for my asthma without air purifiers running!

I just purchased a coway 400 and a levoit Everestair. Have had 2 winix for about two years, Honeywell and germ guardian before that. The coway feels and looks the most premium the coway and levoit both seem nicer upon initial impressions than any of the others but I have only had a few days. One of my winix motor broke about a year and a half in but people generally seem to have good experience with them? The levoit app is really nice and I already had levoit items if you like that sort of option. I bought the levoit for that purpose and the coway because it was on a good sale and recommended by so many. It's kinda loud and annoying pitch to the motor though that's probably going to vary per person

I just see like the newish hap5300 for example and on paper it's very quiet and energy efficient a long time ago had a big unit from them that was Loud so I wonder if people just haven't given the newer ones a chance and they do perform well or if they just don't perform in real life like they do on paper. I'm mostly just curious I suppose. We just yesterday bought an airmega 400 and that is for sure loud but boy does it move the air.

Just wanted to say your comments are so educational! I wish I had found this sub before purchasing my air purifiers but I did end up getting the Coway airmega 400 for my living room, coway 160 for my sons bedroom and have a few Costco winix in the other rooms. The coway sees to pick up much more dust and smells than the Winix. Currently have construction going on in our home and the coway have really picked up so much.