Winix - C909

My recommendation for price/performance USED to be the Taotronics TT-AP003, but unfortunately, it looks like it was discontinued :( All units with HEPA filters have basically the same filter, so don't overthink it. However, the ONE SPEC that matters is [CADR (Clean Air Delivery Rate)](https://en.wikipedia.org/wiki/Clean_air_delivery_rate) - this measures how MUCH air it filters. Manufacturers don't like to advertise this unless it's good - likely because their smaller/worse air purifiers wouldn't sell as well! Also note that the advertised CADR is only at the highest (aka *loudest*) fan speed. *For less noise, it's better to get a larger filter and run it at a lower speed - you don't want a little hurricane in your bedroom all night!* Here's some commonly recommended filters (and some from this reddit thread): * The [Levoit Core 300](https://levoit.com/collections/air-purifiers/products/core300-air-purifier) has a CADR of 135 CFM for $99. * The more expensive [Levoit Core 400S](https://levoit.com/products/core-400s-smart-true-hepa-air-purifier) has a CADR of 260 CFM for $219. * The Wirecutter-recommended [Coway Airmega AP-1512HH](https://cowaymega.com/products/mighty-ap-1512hh?) has a CADR of 232+ CFM for $168 (price as of today) - not a bad deal! * The [Winix C909](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html) has a CADR of 323+ CFM for $199 (Costco online price). Also seems like a good value. * The [Winix C610](https://www.costco.com/winix-c610-4-stage-true-hepa-air-purifier-with-wi-fi-and-additional-filter.product.4000295784.html) has a CADR of 245 for only $129 (Costco online price)! **Probably my recommendation for best price/performance for small/medium rooms.** * The expensive [Dyson HP7](https://www.amazon.com/Dyson-HP07-Purifying-Heater-White/dp/B09LSMRKFD) bladeless heated fan and filter only has a CADR of 80 CFM for $599 (!) You'll notice that filters of similar size have similar CADR. That's because they're essentially a HEPA filter and a fan - it's hard to improve filtration without a larger fan or larger filter. The differences come down to noise level, build quality / customer support, features, and cost of replacement filters. Cheers!

Unless you're comparing build quality, the air purifier with higher Clean Air Delivery Rates (CADRs) and higher Air Changes per Hour (ACH) make for the better air purifier in terms of cleaning performance. Air purifiers cannot overcome walls and doors, so you would need a unit for each room or space. As a rule of thumb, CADRs should be *at minimum* 2/3 of your room's area (assuming an 8 ft. high ceiling). Higher CADRs are needed if you have allergies or sensitivities, high concentrations of pollution are present, or if the purifier is used to combat wildfire smoke particulates. A larger air purifier is not overkill **unless**: * It financially burdens you (unit cost, energy cost, filter replacement costs) * It's too loud on one or more settings you wish to use * It takes up too much physical space In general, air purifiers are not very good at capturing visible dust. Visible dust is a large and heavy relative to other much smaller particulates such as PM2.5. A better solution (but still incomplete) is to build Corsi-Rosenthal boxes with MERV 13 filters. As MERV 13 is less restrictive than HEPA, you can achieve much higher CADRs. The drawbacks to C-R boxes are loudness, a larger footprint, and they also look homemade. Here's a how-to building guide: [https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box](https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box) And a subreddit dedicated to C-R boxes: r/crboxes The optimal solution for visible dust is vacuuming and dusting. Regarding furnace filters in your vents, I would **not** advise putting HEPA filters in them as another user suggested. When it comes to HVAC filtration, you must ensure the pressure drop created by a filter (even if it's 4"-5" thick) does not overwork HVAC equipment. A HEPA filter's restrictiveness could prevent your apartment from getting adequate heating, cooling, and overall ventilation. Ideally you would consult an HVAC technician to determine the highest MERV you can use. If you still want to buy an air purifier, here's my recommendation. u/exitdoorleft - are you a member of Costco? The **Winix C909 Air Purifier** is discounted even further to $159.99 (normally about $200, which is already a great value). The drawbacks are: Winix is mid-tier in quality, the C909 is loud on its highest setting ("Turbo"), and it's an energy hog. More specs below. * Coverage: 4.8 Air Changes per Hour at 500 sq. ft. * Tobacco Smoke CADR: 323 CFM * Dust CADR: 336 CFM * PM2.5 CADR: 330 CFM * Pollen CADR: 384 CFM * Power: 95 W * Price: $159.99 * Link: [https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html)

So I don't know the volume of each room or area. But between your choices, the unit with the higher CADRs is always preferrable in terms of cleaning performance. I can't find the exact Levoit Core 200S-P metrics, just the Levoit Core200S. Again, these units (and most if not all residential air purifiers) are not good for coarse particulates such as visible dust. It may only work if a massive air purifier is in a tiny room. Even if the Levoits are next to the vent, they certainly won't catch everything. With cooking smoke, these purifiers will reduce the particulates a little to somewhat depending on concentrations. As for odors (which are gases and vapors), there is very little sorbent media such as activated carbon. So odor removal capacity may be short-lived. I know this may not be a possibility, but exhaust ventilation is far and away the best remedy for cooking-based pollution. Cooking often generates oily aerosols. These aerosols can form a residue on an air purifier's grill, pre-filter, and mechanical filtration media over time. PS: the Winix C909 is still on sale as of writing.

Yeah, don't buy Dyson air purifiers - almost all of them do a poor job. Freestanding air purifiers can't overcome architectural barriers such as wall and doors. You at least one per room or area. [Per AHAM's rule of thumb](https://ahamverifide.org/ahams-air-filtration-standards/), Clean Air Delivery Rates (CADRs) should be *at minimum* 2/3 of a room's area (assuming an 8 ft. high ceiling). For wildfire smoke treatment, Smoke CADR should *equal* your room's area, again with an assumption of an 8 ft. ceiling. Therefore we would need the length x width x height of each room/area where you'd like a purifier. Purifiers can be very expensive, especially the powerful and quiet models. If you're a member of Costco, have a look at the **Winix C909**. CADRs are in the low to mid-300s CFM. Price is $199.99. This model has an on/off ionizer. Drawbacks: it's fairly loud on the highest setting "Turbo" (around 60 dBA according to the Decibel X phone app). Winix is more of a mid-grade brand; we've had some reports of whirring, whining, or clicking noises after the 2 year mark. This is usually an issue with bad motor bearings. [Link to the Costco Winix C909 is here](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html). Remember that CADRs apply to the highest setting only. Lower speed/fan settings have lower CADRs. In tandem with freestanding purifiers, you can consider installing an HVAC cabinet air purifier. One example is AprilAire. (Other traditional HVAC equipment makers offer these too, such as Trane, American Standard, Lennox, Carrier, Rheem, etc.) The filters are 4-inches to 5-inches deep, which have greater surface area and lower pressure drops than standard 1-inch deep integrated filters. However, if you want to add a cabinet air purifier, be sure to consult an HVAC technician to do load calculations. Choosing too high a MERV filter rating can overtax your equipment and lead to reduced ventilation. Keep in mind that HVAC cabinet air purifiers do not immediately address particulates *within* each room or area. They're best at preventing recirculation of said pollutants throughout the house (in addition to keeping the blower wheel and evaporator coil cleaner).

Unfortunately that's a low budget for the space's size. You are correct about CADRs; keep in mind those are minimum recommendations. If smoke particles/ash/soot levels are especially heavy, 800 CFM CADRs may not be enough. Usually the best value HEPA purifier is the **Winix C909** at [Costco Canada for $289.99](https://www.costco.ca/winix-c909-4-stage-air-purifier-with-wifi-and-plasmawave-technology.product.4000257649.html). Smoke CADR is 323 CFM. If you need to maintain a strict budget, you could consider the **AirFanta 3Pro**, inspired by a Corsi-Rosenthal box design. It uses proprietary Efficient Particle Air (EPA) E11 filters. [E11 is two filter classes below HEPA H13](https://www.airum.com/frontend/immagini/files/EN%201822-1.PDF). This means E11 is less efficient on a single pass, but allows for greater air flow and CADRs. The top speed's composite CADR is 413 CFM for the CARB Edition. [Price for one unit is $229 Canadian](https://air-fanta.com/products/airfanta-3pro).\* You would need two units running at top speed to meet the minimum CADR. \*I added the 3Pro to my cart and in checkout, selected Canada as the shipping destination to see the adjusted product price. AirFanta is not a big player like Winix, Coway, or Levoit. But their filters did sell out during the southern California wildfires back in January. I assume they're in good standing business-wise.

Hard to say. I don't know how closed off they are or what they look like. How large is the opening to each sectioned "room"? Another consideration may be sound levels. Most purifier brands lowball their top sound levels. I own a Winix C909. Combined Smoke CADRs are 646 CFM. On the highest setting called "Turbo", I used the Decibel X Android app and got a reading of 60 dBA. Using a basic [Decibel Calculator](https://noisetools.net/decibelcalculator), running both at this speed would be 63 dB(A). Three Coway Airmega 150 units give you a combined Smoke CADR of 459 CFM. Again using the Decibel Calculator, the three units would be 53.1 dB(A). CADRs are for the highest speed settings only. I don't think Winix measures CADRs for other speeds/fan settings.

Yes, it will still accumulate. Dust can be made of various substances: dead skin, hair, animal dander, insect parts, outdoor (e.g., vehicle) pollution, carpet/rug fibers, bacteria, other textile fibers, pollen, soil particles, mold/mold fragments, microplastics, and dust mites + their droppings to name a few. You might be able to noticeably reduce visible dust if you ran a wildly oversized air purifier in a small space. But for example, my Winix C909 with a Dust CADR of 336 CFM in a \~175 sq. ft. room with an 8 ft. ceiling does not eliminate dust on the windowsills. Then again, I don't run it at the very top CADR most of the time either.

he Coway models you listed would be underpowered for the \~500 sq. ft. space; you'd need \~334 CFM CADRs. CADRs should be *at minimum* 2/3 of a room's area (assuming an 8 ft. ceiling). I would avoid the Coway Airmega 100 in particular. Coway is better quality than almost all other consumer brands on the market, but they're more expensive. Some of their Smoke CADRs are low even on the more expensive models. So you'd need two air purifiers to meet CADRs in that room (e.g., one [Coway Airmega 240](https://cowaymega.ca/products/airmega-240?variant=40263676592170) and a [Coway Airmega 160](https://cowaymega.ca/products/airmega-160)). The only purifier that comes close to all except one particulate CADR and budget is the Winix C909. Drawbacks: it's loud on "Turbo"; using the Decibel X app, my C909 measured 60 dBA. Winix is more mid-grade with some people reporting whirring, whining, or clicking noises after the 2 year mark. This is usually a motor bearings issue. PlasmaWave (the ionizer) generally aids the Pollen CADR. It's possible you could see a drop in this value if it's turned off. Keep in mind CADRs are for the highest speed setting only. Lower speeds have lower CADRs. **Winix C909** * Dust CADR: 336 CFM * Pollen CADR: 384 CFM * Smoke CADR: 323 CFM * Price: [$289.99 CAD at Costco.com only](https://www.costco.ca/winix-c909-4-stage-air-purifier-with-wifi-and-plasmawave-technology.product.4000257649.html) EDITED: I glossed over your post and didn't see the "Canada" bit. I've corrected links to their Canadian countertparts.

Because of the higher ceilings, your room's volume is 1,400 cubic feet. Divide 1,400 by 8 ft. to get **175 sq. ft.**, which is the figure you should be using. Air purifier coverage ratings are given in square feet, but they assume an 8 ft. high ceiling. I'm less keen on the HoMedics model because of the cylindrical design. Some cylindrical purifiers have underpowered motors which must spin at higher speeds to deliver adequate air flow. This causes them to burn out sooner potentially. Additionally, most cylindrical purifier filters have an integrated pre-filter. A separate permanent pre-filter is preferred for ease of cleaning off coarse dust without damage to the HEPA or other mechanical filtration underneath. Lastly, HoMedic's build quality and reliability may not be the greatest according to Consumer Reports feedback. Considering the AQI is very bad, I would consider the **Winix C909** which is sold at [Costco.com only](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi--plasmawave-technology.product.100842491.html). It has higher CADRs including Smoke CADR which means it can clean a room faster and more effectively. Winix is more mid-tier in quality and their purifiers are known for being loud on the highest setting ("Turbo"). * AHAM Verifide: 4.8 Air Changes per Hour at 500 sq. ft. * CADR Dust: 336 CFM * CADR Pollen: 384 CFM * CADR Smoke: 323 CFM * Power Consumption: 95W * Price: $199.99 There's a potential problem with electrostatically-charged MERV filters and smoke: in short, smoke particles may significantly impact CADRs. This is from an article by the Healthy Buildings program at Harvard called ["Protecting your Health from Wildfire Smoke – Spotlight on Filters"](https://healthybuildings.hsph.harvard.edu/protecting-your-health-from-wildfire-smoke-spotlight-on-filters/). Skip down to the **Impact of Wildfires on Filter Performance** heading. I've quoted it below: >Wildfires bring an additional layer of complexity to this performance decline issue. It is postulated that deposited smoke particles, which carry a charge \[23\], on these electrostatically-charged filters can either mask or counter the intended filter charge, thus reducing the intended electrostatic removal mechanism \[9\], \[21\]. A recent controlled chamber study demonstrated that the Clean Air Delivery Rate (CADR) of a Do-It-Yourself (DIY) air cleaner using 1 inch electrostatic MERV-13 filters is reduced significantly when the filter is loaded with smoke \[9\]. The researchers observed that the CADR of the DIY air cleaners equipped with electrostatic air filters was reduced by 95%, while airflow through the filter was maintained (only 7% increase in pressure drop), pointing to a loss in the electrostatic attraction mechanism as the likely cause of filter performance decline since airflow appeared to be maintained. This occurrence has been observed in other studies with cigarette smoke and intentionally discharging the filter with isopropyl alcohol \[9\]. Other studies that investigated longer term and more realistic test conditions note similar findings, with one study observing a substantial reduction in particle removal efficiency over a 19-week period of operation in an air handling unit that supplies outside air \[19\]. The exact mechanisms and magnitude of the decrease is difficult to predict in practice, due to numerous factors, such as the amount and composition of particle loading on the filter \[21\]. Nevertheless, reductions in filtration effectiveness can be up to a factor of two or more \[21\].

The **Winix 5500-2** has the highest Clean Air Delivery Rates (CADRs) including Dust. This will give the best cleaning performance of all the choices listed. I don't know if you're strictly limited to the units above, but if you or someone you know is a Costco member the **Winix C909** has even higher CADRs and a larger coverage area (4.8 Air Changes per Hour at 500 sq. ft.). It's ~~on sale for $159.99~~ at Costco.com. Drawbacks: the **Winix C909** has a max Power Consumption of 95 W so it uses more energy than the 5500-2. It also has a carbon-sprayed plastic sheet instead of activated carbon pellets. It will be quite loud on the "Turbo" setting (although 5500-2 is likely similar). Link: [https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html) **Edit**: the price of the C909 is now back up to $199.99.

I would definitely address the airtightness issues with the windows if feasible—your energy costs and air quality control will improve greatly. Avoid both Bissell and Shark. What does your HVAC look like? If possible, you could upgrade to a "whole house" cabinet air cleaner. These are sold by HVAC equipment brands (Carrier, Lennox, Trane, American Standard, etc.) and by another company called AprilAire. Generally cabinet air cleaners have 4" to 5" thick filters, which offer more surface area, better filtration, and lower pressure drops than many 1" thick filters. While a higher MERV can capture more particulates, many residential HVAC systems cannot overcome the pressure drops of a MERV 16 filter. If necessary, you can consult a licensed HVAC contractor to do the load calculations and make a recommendation. If the budget's an issue, consider using 3M's 1" Filtrete Filters, specifically the Filtrete 1900 (MERV 13). In general, you will need at least one air purifier per room or area. With the high 12' ceilings, you need to calculate for room volume (W x L x H) instead of room area. Where air purifier coverage is given, it's in square feet. This measurement assumes an 8 ft. high ceiling. So if you want a purifier's volume coverage, just multiply the square footage rating by 8 feet. You can add multiple air purifiers to a space in order to increase Clean Air Delivery Rates (CADRs). Unfortunately most air purifiers aren't great for pet hair. Hair—relative to other much smaller particulates such as PM2.5—are large and heavy. Unless the hair is cast off very close to the purifier, it won't be caught in the pre-filter. Corsi-Rosenthal boxes using MERV 13 filters can have much higher air flow and capture more pet hair than most HEPA air purifiers. Vacuuming will be the best means of combatting pet hair. Generally Coway air purifiers are often recommended as they're higher quality and perform well. The exact model will depend on each room's volume. Winix is more mid-quality, but can be more affordable if you're on a budget. I own a Winix C909 which is sold at Costco and is a fantastic value given the CADRs. However, it is quite loud on the highest setting (Turbo). It's for removing particulates only and not gases. **Winix C909** * Room Size: 500 ft.^(2) in area or 4,000 cubic feet in volume * Tobacco Smoke CADR: 323 CFM * Dust CADR: 336 CFM * PM2.5 CADR: 330 CFM * Pollen CADR: 384 CFM * Power: 95 W * Price: $199.99 at [Costco.com only](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html) Other recommendations could be Smart Air, specifically the **Smart Air Blast MKII Air Purifier**. It's very quiet (43 dBA), has a metal body with locking wheels, and has a top Composite CADR of 559 CFM, but it's very expensive at $929.00. Power consumption is 118 watts. **Medify Air** makes some very high performance CADR purifiers, but quite a few—such as the [MA-112](https://medifyair.com/collections/all-products/products/ma-112)—are very loud (at 70 dBA). Except for their MA-112, most other Medify Air models have integrated pre-filters which are overlaid on the HEPA media. This is a problem as the pre-filter needs regular cleaning and it's very easy to damage the HEPA media underneath (especially if you're using a vacuum).

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.

I've owned a Winix C909 for a little over a year now. I like it - it's oversized for my 175 sq. ft. office room. Winix is lower quality than Coway generally. Some people have reported whining, whirring, or clicking noises after the 2 year mark, which are usually bad motor bearings. The C909 is fairly loud on the highest setting called "Turbo" (about 60 dBA according to the Decibel X Android app). It's also not energy efficient at 95 W. The C909 also has PlasmaWave, a bipolar ionizer. This can be switched off.

I think the best purifier at Costco now is the Winix C909. CADRs are in the 300s CFM for $199.99. I own one and it's very good value, but it is fairly loud on "Turbo" - around 60 dBA according to the Decibel X Android app. That being said, I think there are other brands with better build quality such as Coway and Alen.

I own a Winix C909 and am very happy with it. But the feedback I've read in this subreddit and seen in reviews is that Coway makes better quality units than Winix. The only Coway purifier quality issues I've seen are rattling/balance issues with the Airmega Mighty AP-1512HH. That and some people complain Coway filters off gas.

Have you read our [sticky post at the top of the subreddit](https://www.reddit.com/r/AirPurifiers/comments/1jxgjwf/sticky_purifiers_and_dust_reduction/) or the [FAQs wiki page](https://www.reddit.com/r/AirPurifiers/wiki/index/faqs/) entries about dust? Air purifiers aren't good at reducing visible dust as it's large and heavy. I would always avoid Shark. It's a low quality brand and we've had multiple reports of the air quality display not working. Coway purifiers are generally the best quality in the consumer-grade market (although they're more expensive). However, you'd have to buy one with the letter *S* appended to the model name. S-letter models have app connectivity. A great value for money is the Winix C909 sold on Costco.com. It has PlasmaWave, a bipolar ionizer that may be turned on or off. The C909 will be fairly loud on the highest setting called "Turbo" - about 60 dBA according to the Decibel X Android app and it's not very energy efficient at 95W. But purifiers need to be sized by room volume - so please list your room's length x width x height. See **Rule 4**.

There's give and take. Winix and Levoit tend to be cheaper when buying the unit and for most filter replacements. You generally have to shell out money for quieter performance while meeting CADRs. For Winix, units have a 2 years warranty, are louder on the highest setting, use more energy per CADR (for flat filter models), and are mid-grade build quality. Some people have issues with bad motor bearings in Winix models after the 2 year mark. I have a Winix C909 from Costco. I don't run it on the highest setting ("Turbo") generally because it's too loud for a 175 sq. ft. office; it uses 95 W on Turbo. Filter replacements are still very cheap from [The Home Depot](https://www.homedepot.com/p/Winix-True-HEPA-4-Filter-Activated-Carbon-Replacement-Filter-A-115115/202034412). Levoit uses the IEST-RP-CC001.6 Recommended Practice (RP) Class H HEPA for (all?) filters and not a HEPA standard. Warranty is 2 years and may be somewhat louder on the highest setting. Build quality is likely mid to above average for the Vital series and EverestAir... I don't know exactly if or when these develop more serious problems or failures.

First, air purifiers aren't very good at reducing visible dust. It's comparatively large and heavy. You can capture more visible dust by oversizing a purifier. If you have high pollution levels, it's recommended to oversize a purifier. I don't know how much you want to pay for a purifier and its filters. That's why we ask for a budget. You're requesting "the best". Quality and cleaning capacity aren't cheap. For the 12' x 20' room, the [Coway Airmega 400](https://cowaymega.com/products/airmega-400) should fit hopefully. The [Airmega 400 Max2 Filter Set](https://cowaymega.com/products/airmega-400-max2-filter-set?variant=33436452323463) is $129 at most, but can be bought for $83 on Amazon. This purifier is for **particulates** (dust, dander, mold spores). However, this model is *not* good for odors. Odors are gases. If you want something cheaper for **particulates only**, have a look at the [Winix C909](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html) sold at Costco.com. You can buy [replacement filters at The Home Depot ($27.99)](https://www.homedepot.com/p/Winix-True-HEPA-4-Filter-Activated-Carbon-Replacement-Filter-A-115115/202034412). Keep the PlasmaWave function turned off. Like I said before, the AllerAir you linked will NOT be good for particulates. AllerAir is for **gases/vapors/odors**. Replacement carbon canisters will be expensive: anywhere from $219 to $336. That is just the nature of high weight activated carbon purifiers. This is why I said you need two different purifiers: one for particulates and one for gases/vapors/odors.

No. PlasmaWave is a bipolar ion generator. From [Winix Switzerland](https://winix.ch/en/blog/plasmawave-technology/): >"These are positive hydrogens (H+) and negative oxygen ions (-O2). Together they form hydroxyl radicals" Certain ionizers have the *potential* to produce ozone. However, Winix's PlasmaWave is [CARB-certified](https://ww2.arb.ca.gov/list-carb-certified-air-cleaning-devices). This means an "ozone emission concentration limit of 0.050 parts per million (50 ppb)". Keep in mind any ozone produced can be *much lower* than 0.050 ppm or 50 ppb limit. Since you have birds, I would definitely keep PlasmaWave off to be safe if you bought this purifier. Hypothetically speaking. The Winix C909 is good for particulates and very bad for odors. It basically has no activated carbon. You would need many pounds of activated carbon for odors, as seen in the AllerAir purifier you linked. But even with many pounds, certain gases/odors may not be well-adsorbed by untreated activated carbon. This can cause the activated carbon to develop a strange smell (sometimes a "sweet" smell, which can be acetaldehyde). We do not know the odors or gases in your space. Therefore I'm wary of recommending the expensive AllerAir purifier you linked (https://allerair.com/products/airmedic-pro-6-plus?variant=42969116174) in case it doesn't work on the odorific gases present or if it causes new odors to manifest.

For a 500 sq. ft. studio, the AHAM 2/3 rule stipulates you need **minimum Clean Air Delivery Rates (CADRs) of 334 CFM**. AHAM 2/3 rule is mentioned the AutoModerator comment. The [Medify Air MA-25](https://medifyair.com/products/medify-ma-25-air-purifier?variant=31541953691715) has a top Smoke CADR of 110 CFM. You need *three* of these units running on the highest airflow speed/setting to get close to min. CADRs. The [Coway Airmega 50](https://cowaymega.com/products/airmega-50) or [Airmega 100](https://cowaymega.com/products/airmega-100) would also be very underpowered. A correction regarding particle size you mentioned: 0.3 microns (or a value/range close to it) is the hardest particle size to capture. This is known otherwise as Most Penetrating Particle Size (MPPS). It *doesn't* mean that smaller particles aren't captured by Winix's HEPA filters. In fact, particles larger *and* smaller than 0.3 microns may be captured with equal or greater effiiciency. [In a blog post, Winix makes the claim—without linking any test reports—of filtration down to 0.003 microns](https://www.winixamerica.com/2021/07/22/ultrafine-particles-the-good-the-bad-and-the-tiny/): >Fortunately, Winix offers a True HEPA filter that goes beyond what can be found on the market today. Every Winix air purifier boasts this industry leading True HEPA filter, which captures 99.99%\* of airborne contaminants down to 0.003 microns in size. \*Based on independent laboratory tests conducted on inanimate particles as small as 0.003 microns. To be fair, Medify Air published a test report on their H13 HEPA [Sub-micron Particulate Filtration Efficiency](https://cdn.shopify.com/s/files/1/0575/1059/2661/files/2023_H13_Filtration_Report_GZHT02739549.pdf) using the ASTM F2100-21 standard‡. As mentioned in Section 9.3, the test measured "initial particle filtration efficiency of materials using monodispersed aerosols containing suspended latex spheres particulates of 0.1μm diameter". Filtration efficiency was 99.9%. The filter test area for each sample was 100 cm^(2) or 15.5 in^(2). ‡[ASTM F2100-21 "Standard Specification for Performance of Materials Used in Medical Face Masks"](https://cdn.standards.iteh.ai/samples/109609/5b29edb6b36f4ac6aa8fb3b36becad6f/ASTM-F2100-21.pdf) is an older version. The most current is now [ASTM F2100-25](https://store.astm.org/f2100-25.html). Even the [Winix C909 ($199.99 at Costco online)](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html) is slightly short on minimum CADRs, where its top Smoke CADR is 323 CFM. This would be on the highest speed or setting called "Turbo". So if I were you, I might go for the Winix C909. It's fairly loud on "Turbo" at 60 dBA (according to the Decibel X Android app) and an energy hog, but it would be closer to min. CADRs.

It will do very little for the dust floating throughout the room, sorry to say. You need incredibly strong air intake and a large filter surface area to significantly reduce dust. I have a Winix C909 purifier with a Dust Clean Air Delivery Rate (CADR) of 336 CFM in a 175 sq. ft. room. This is considered oversized. Even if I run it at top speed for hours on end to achieve the Dust CADR, I can still see airborne dust.

I need the length x width x height of the room(s) where the purifiers will be. This helps us assess particulate Clean Air Delivery Rates (CADRs). If CADRs are too low, you may not be reducing pollutants meaningfully. NB: most common consumer-grade purifier brands—which includes what's sold at Costco—have little capacity to remove gases, vapors, or odors. This is due to very low weights of sorbent media like activated carbon, activated alumina, or synthetic zeolites.

Thanks! Okay, that is big. [Per AHAM](https://ahamverifide.org/ahams-air-filtration-standards/), Clean Air Delivery Rates (CADRs) should be at least 2/3 of a room's area (assuming an 8 ft. ceiling height). Your room is 676.5 sq. ft. Therefore minimum CADRs should be **451 CFM**. You may need even [higher CADRs in certain circumstances](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). The best purifier Costco offers is the **Winix C909** ([$199.99](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html)), which is online only. Its CADRs (for dust, pollen, and smoke) are in the 300s CFM which are too low. You would need two Winix C909 units for this room. A few drawbacks to the C909: Winix is more a mid-grade brand. We've had reports of units developing whining, whirring, or clicking noises after the 2 year mark. This is usually an issue with bad motor bearings. The C909 is loud on its highest setting ("Turbo") at 60 dBA according to the Decibel X Android app. It's also not the most energy efficient, using 95 W on Turbo. If you have pet birds, keep the PlasmaWave ionizer off. I would *avoid* the Winix XQ, in case you're curious. [A number of reviews at Winix](https://www.winixamerica.com/product/xq/) claim this model fails completely within a few years.

Shark is lower quality and uses misleading marketing. Take "NeverChange". It claims you don't need to change the filter for up to 5 years. If you look on the product page, the NeverChange applies to a much smaller square footage, specifically 300 sq. ft. This is also mentioned in the manual: >"Tested to GB/T18801-2015 P.CCM, based on 50% CADR declined, 300 sq. ft. cleaning area and 12 hours daily operation on MAX fan speed." A filter's time to saturation depends on pollution levels. The coverage is also overblown for the HP302 model. You're only getting 1 Air Change per Hour (ACH) at 1,400 sq. ft. The minimum ACH would be 4.8-5 ACH in normal pollution circumstances. The absolute largest room size in which I'd use a the Shark is 306 sq. ft. (assuming an 8 ft. high ceiling) according to the [AHAM 2/3 rule](https://ahamverifide.org/ahams-air-filtration-standards/). I would return the Shark and buy the [Winix C909](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi--plasmawave-technology.product.100842491.html) instead.

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.

Ah okay, there wasn't a budget in your post. You have the option of making your own Corsi-Rosenthal box with MERV 13 furnace filters ([ideally with PC fans](https://itsairborne.com/pc-fan-corsi-rosenthal-guide-a611dabf7e0c) for quieter and more energy efficient operation). MERV 13 is less efficient than HEPA standard filters, meaning it captures fewer particles of certain sizes on a single pass. But MERV 13 allows for more passes through filters faster which increases CADRs. Note: most C-R box configurations do *not* have a fine mesh pre-filter. Without these pre-filters, the MERV filters can clog faster with coarse particulates such as pet hair and visible dust. A less DIY option is the **AirFanta 3Pro**. It uses proprietary Efficient Particulate Air (EPA) E11 filters. EPA E11 is two filter classes below HEPA H13 in the EN 1822-1:2019 standard. Top composite CADR for the CARB Edition is 413 CFM. The 3Pro may be somewhat loud on the highest airflow speed. It has metal grating protecting the filters, but no fine mesh pre-filters so it could clog sooner due to coarse particulates. [Price is $159.99](https://air-fanta.com/products/airfanta-3pro). If you still want a conventional HEPA purifier, an option that meets or is close to minimum CADRs would be the **Winix C909** from [Costco.com ($199.99)](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html). I own one. On its highest speed called "Turbo", sound levels were 60 dBA according to the Decibel X Android app, so it may be a bit loud. Again, if you want to keep PlasmaWave (bipolar ionizer) off, it will likely decrease Pollen CADR.

The [C909 CADRs are definitely on the Costco page](https://www.costco.com/winix-c909-4-stage-air-purifier-with-wi-fi-%2526-plasmawave-technology.product.100842491.html). Click on the "Specifications" tab. * Dust: 336 CFM * Pollen: 384 CFM * Smoke: 323 CFM Disabling PlasmaWave will likely affect Pollen CADR negatively. And the CADRs listed here are for the highest airflow speed/setting only, called "Turbo". Lower settings will have lower CADRs.

Yes, I think so (although I've never owned a Coway). I have a [Winix C909](https://www.costco.com/p/-/winix-c909-4-stage-air-purifier-with-wi-fi-plasmawave-technology/100842491) from Costco. Based on feedback in this sub, Coway has better build quality, is more energy efficient, offers better warranties, and is quieter than other consumer-grade brands. Winix purifiers are more mid-quality. There's the possible issue of bad motor bearings cropping up after the 2 year mark. Winix tends to be louder and less energy efficient than Coway. But most Winix models offer smart features via an app and the filters tend to be cheaper for models. The latter is *not* the case for the [Winix 5510](https://www.winixamerica.com/product/5510/) and [Winix 5520](https://www.winixamerica.com/product/5520/) yet. Currently the genuine [Winix Filter Q – 1712-0123-00 set](https://www.winixamerica.com/product/filter-q-1712-0123-00/) tends to be full price ($79.99) from Winix and many retailers. If you'd like a recommendation for other models, please see **Rule 4** or the AutoModerator comment. Room dimensions (length x width x height) are very important.

I was going to build one with a box fan, but I figured this is probably just the new normal for summers going forward so I ordered one from Costco. Working well so far. [https://www.costco.ca/winix-c909-4-stage-air-purifier-with-wifi-and-plasmawave-technology.product.4000257649.html](https://www.costco.ca/winix-c909-4-stage-air-purifier-with-wifi-and-plasmawave-technology.product.4000257649.html) They also have one in store that does a little less area.

I have both and like this one better. The C909 is louder on low-high but about the same on turbo. You also can't turn the indicator lights off on the C909.

It does. If you don't mind it being slightly louder and somewhat bulky it's definitely a good air purifier. I like the filters in it better it has a washable pre filter. It also goes on sale occasionally

This one was $100 on sale and is supposedly rated for more Sq ft than the 535. I also have a C909 which is bigger and uses the same filters as yours but I personally prefer the 610.

I bought the C909 that was on sale previously. It works well however developed the annoying whining sound. Apparently that's a frequent issue with those.

It does have a better air flow than the c545. But if you're allergic to the cat it might be worth switching them to one of the allergy cat foods. I've had no issues with the two c909s we have in our house. One I snagged from winix officially refurbished. But those can be hit or miss to catch and sell out pretty quick.

Yep as far as air purifiers the more the merrier. Especially if you don't want to run them loud. My house currently has 2xc909 2x545 and 1x5300 our air quality is pretty good so the filter lasts but it's great for pollen and other things.

I'm a fan of winix but largely because of after market filter prices. I have currently multiple c545 and a c909. If your budget /space is fine for the unit then there's no harm going larger if anything it will just let it clear the air faster and likely at a lower volume than a smaller unit would.

Winix is great for aftermarket filter options. For rooms we have smaller c545 that are pretty cheap refurbished direct from winix. And then our large valued area we have two c909s one I got from Costco online another I got for refurbished from winix. But stock is hard to come by for the refurbs direct from winix and sells out fast. When I buy filters off Amazon I normally look for multi packs 2,3 etc as normally you can get a better deal that way. Official filters get pricey really fast

C909s from Costco are pretty good cost to filter ratio if you need a lot. C545 for individual rooms is hard to beat for its price. For the Costco version it's 199 online retail the c909 is 329

Seems like a good air purifier but tbh. 700 seems like quite a lot. You could buy 3 and a half winix c909s from Costco online for the same price as one.

The winix c909 uses HEPA filters in it. Costco often also gives you an extra filter set in the box. Pretty amazing deal for 199 if you have a membership

Forgot to mention I don't recommend the new winix 5520 from Amazon over the c909 because it has a louder fan and lower cadr rating for basically the same price.

I have a Winix c909 I got from Costco and I leave it on high in my bedroom for the perfect background fan noise. We used to have a box fan in the hallway and I got used to that noise and got rid of that fan for kid safety. This is the closest thing I’ve found. I think it would be the right size for your room, they have a similar one on the Winix website if you don’t have a Costco.

I have the feature turned off on all 3 of them, but I did leave it on for a day or so in two of the rooms when I got them to see if it made any differences or made us feel bad. It was in an office and a bedroom our pets and kid weren’t in, so kind of a safe test, I guess. I didn’t notice anything different. I guess some people get headaches or feel off. I did read that it can make the air drier and that’s definitely not something I want, so I’ve just turned it off on all of them. I recently found out I have a bunch of allergies- including my dog, so I got these Winix units to try and help combat the allergies. Within about 45 minutes of running one in my living room, part of my nose that has been clogged for as long as I can remember opened up. I’m breathing better than I have in years. We’re moving to a larger house soon, and I will absolutely pick up a couple more.

Thanks btw! I got the c909 and love it so far.

If you have an enclosed printer I really like the bentobox. You can build it yourself or buy online. I use mine on top of a winix c909 im the same room. https://www.printables.com/model/272525-bentobox-v20-carbon-filter-for-bambu-lab-x1c-enclo

Costco.com. Winix C909. Comes with 2 years of filters. Was in the same position as you last month. So far it’s great. We move it to the room we are spending the most time in (typically living room in the day, bedroom at night). Its auto mode is simple and it’s basically plug it in and walk away.

The Winix deal on Costco is unbeatable. Fits that budget and you get 2 years of filters.

Costco.com online only deal: Winix C909 for $199 https://preview.redd.it/v7hz6apnldpf1.jpeg?width=1290&format=pjpg&auto=webp&s=ea72fc051a16bc02fa4625962781cf0d016802db Comes with 2 years worth of air filters (stored inside the machine when it arrives to you- I had to figure that out lol). I was researching so many brands and even bought a couple on Amazon only to return them. The C909 is what I was looking for and works great.

I have a Winix C909 in the living room that I bought at Costco. I use the homebridge plugin to monitor when the TV is on, and then I have it automatically change from Auto mode to Sleep mode (quiet, but still on). When the TV is off, it goes back to Auto. Of course, if I had one that had a physical switch that could be left on auto/on, I could just have used a smart outlet instead.

If you are going Coway, rough estimate would be, you would need 2-400 for main room and 1-300 for each of the other rooms or could possibly get away with the Mighty for the kids rooms. Most of the carbon in Coway filters are not going to be a good amount if you are looking to maximize carbon filtration as many other air purifiers unless you get one that is 15-20+ pounds of carbon which will probably be $700-1200/each. If you are ok with the need for pre filter and hepa filter and want to go on a budget and stick to one filter for all, i would suggest Winix C909 at Costco or wherever there is a deal. I know Costco offers a few more filters as a bonus. Just my thouguts.

I have the Winix C909 and Coway Pro X. Yes they are completely in terms of size and need, but they both feel like nice quality to me. I use each in the appropriate size room and it feels the same to me 🤷🏻‍♂️. Only bought both when they were on sale though. I personally think Coway is only worth it on a good sale

Winix C909 from Costco if you have a large space.

You can get the Winix C909 at costco website for $160, with 2yrs worth of filter supplies included(sale end on 5/11, online only, discount limit 5 per customer, no membership required), and home depot sell 1yr worth of filter supply for the c909 at $27.99, it’s has one of the largest coverage area among winix air purifier(just behind the xq tower, which i dont recommend), the performance to price ratio is unmatch.

We had a Winix C909 for a year and happy with it. Quiet, effective and filter life seems to be long.

Winix is a good brand. I have the C909. You have to spend 5x more if you want true odor control. The little carbon filter isn't doing a whole lot. /r/AirPurifiers is a good source. Mine came with enough carbon filters to change them monthly. Set a remind to do it. If you clean week and there is a pre-filter vacuum that out every week.

I have a Winix C909 from Costco. It sucks up a lot of dust. I have two smaller units in each of the kid's bedrooms that also suck up a lot of dust and run very quiet. With that I doubt I'm even at like half of what I'd need for my modest 1900sqft house. Like the comment says they make their money on replacement filters. You can buy generic if true HEPA isn't import. My pre-filters before you even get the HEPA will fill with dust. Ikea makes more visually appealing filters that IIRC score well on filtering.

Air purifiers in the 250-400 CADR range are mass produced volume products sold at reasonably low margins. The filters are similarly more affordable and can be found everywhere. Larger air purifiers don't really have any advantages. They're generally more expensive to purchase, power and maintain for the amount of air volume they handle. For 950 sq ft I'd buy 3 Blueair 211i or 3 Winix C909 (Costco model) purifiers. Remember that the AHAM rated square footage on these units is based on (1) running them constantly on the loudest turbo mode and (2) having a lowish 8 foot ceiling height. The Winix C909's are notably less efficient, but they have separately replaceable carbon filters and easier to clean prefilters (washable screens vs fabric). Also, if you're concerned about noise you could buy 4-5 of either of these filters and run them on high (instead of turbo) to get similar coverage. The typical recommendation is to hit 5x air changes per hour - essentially to clean the indoor air at a rate faster than it's typically being exchanged with outdoor air. In my experience hitting 6-10x air changes per hour is actually a significant improvement over 5x though.

Get the C909 if you’re at Costco. Online only. Way better

Ditch the circular C610. It’s not great. Winix uses ionizers, which you don’t want, so if you go with a Winix you want to make sure you can switch it off. The downside to Winix and Coway is that they are loud on the higher settings, so you want to get a more powerful unit than you need for your spaces so that you can run them on a lower speed. The c909 would work for all three of your spaces though. Assuming 8ft ceilings, Airmega 160 is going to be too small for your living room and barely good for your bedroom. 240 would be fine for all three rooms. Personally, I would go with Coway over Winix just because then you don’t have to worry about turning off the ionizer, but they are both good brands though.

I prefer winix products, they do there job , nothing fancy

Yes, they really work. You only have to run it for a week and check the washable filter to know it works. We have winix and levoit, both are relatively inexpensive and pull a ton of crap out of the air.

I have a Winix that we use in the common areas. I like that it has HEPA filtration because my husband has emphysema. I can't say that it helps a great deal with dust though. I think my unit was $300-$400.

I have two Winx filters and they work really well but after 3 years or so the motors start making a ticking sound. I contacted the manufacturer who is not willing to sell me a motor and suggested I just buy a whole new units...

Winix Plasma Wave is an affordable effective unit. I used three when I lived in a polluted area. I now use it sporadically to clean up the plastic dust and other crap that accumulates in a home

I’ve been really impressed by my Winix. I have a huge one that really seems to do the job. I change the filter once the year but vacuum it all out more often than that to keep it running really well.

I’ve been using my Winix with Plasmawave since 2019 without issue, and that includes moving about once per year. These units have held up to that. I can tell you they really work. I have a mold allergy, and mold is literally everywhere in outdoor or indoor air with spores just waiting to land in a suitable environment for growth, but I have no symptoms at home with my two small Winix. I also have pets. These reduce any odors from that, and they are at what one might consider end of life for a typical air filter system. 5 years is typical. 10 is incredible. I am not washing the pre-filter nearly as often as I should and am slow to replace the carbon and HEPA filters sometimes, so 5+ is just astounding in my case.

The PlasmaWave I looked at used an ionizer which is a huge no for me.

PlasmaWave is just a glorified ionizer. I personally cannot stand the scent of ionizers, it gives me headaches.

You want a HEPA filter and actual activated carbon granules-sometimes the activated carbon is just a paper thin layer-not doing much. For cost, consider replacement filter costs not just up front ones. I also like ones that have a sensor so you can leave it on “auto” and it will kick on when you cook or air gets worse without you having to keep track of it. Also don’t splurge on plasma ion or ozone or whatever else-mixed studies show it can react with chemicals to form more dangerous ones at worst and generally not much better at best. Right now you may want to sacrifice optimality for actually having something going to clean your air since it’s a time of high uncertainty. What’s in stock at home depot may be superior to the “best” air purifier that arrives in 2 weeks. Those caveats-no one can give better advice based on “feel” than what’s tests show-and wirecutter actually tested performance https://www.nytimes.com/wirecutter/reviews/best-air-purifier/ . If you prefer anecdotes, here are some of my experiences: Winnix has been in stock at home depot. I evacuated with my air purifier and I needed something to leave during cleaning to try and detox my pasadena apartment. It was in stock and had hepa+carbon-it seems to be working. Oransi is the one I evacuated with, love the looks, it really seems to work well, lots of aftermarket filters available-downside is that sleep mode sets fan speed to auto, I want it to just turn lights off and leave the fan mode. But It has lasted at least 6+ years. Levoit is what was at the apartment I evacuated to. It seems a little less powerful per dollar spent than my oransi, but it’s night mode turns off the lights while still letting you set the fan speed. My roommate left a Coway going in his room and that thing worked very well to prevent any smoke smell from settling, and it’s highly recommended by wirecutter. If I had to buy right now and I could get one in a reasonable timeline, it’s how I would go.

Any filter with a charcoal filter layer will help some (Winix is one brand commonly available at Costco…I also have a more elaborate Rowenta)…my Winix came with multiple charcoal layer replacements. Dealing with total incontinence here, and not to criticize your MILs efforts, but you might want to look into the actual sources of the odors. Chairs, clothes that sit around waiting for wash, previously soaked furniture or carpet? If bedding or fabric furniture smells and you can replace it, do so. I use a combo of Depends on my father, and all his sleeping or seating surfaces have a first layer of puppy pee pads (Costco has large ones that work well and are cheap), and then a fabric layer on top (whether sheets or a chair cover or towel, tucked into the sides of the chair). Once he’s wet, after I changes his pants all clothes and chair covers and bedding goes in the wash (3-5 loads a day).  For the mattress you can find on Amazon washable mattress covers (the whole bed ones don’t work that well but that’s my base layer and then a thicker more absorbent one that I fit across the middle section of his bed, and on top of that layered dog pee pads).  So again, not sure if any of this advice helps but this method works for me.

I have 2 Winix HEPAs that have been running 24/7 for 6+ years. I clean the screen every week or so, replace the carbon every month, and the HEPA every ~8 months.