8 Best Filterless Air Purifier In 2021 (No Filter Change Ever)

Depending on what angle you look at the best filterless air purifier. It can be an eco-friendly machine that saves a lot of time and effort in maintenance. It can also be looked upon as a sub-standard unit that falls behind a HEPA air cleaner. There are some that even argue on the usefulness as there is no filter involved. To search for a particular model according to your needs, we have conducted endless hours of testing, comparison, and reviews. Whatever takes you have, we're here to rebut the negative aspects and lead you to a whole new perspective on what a filter-free air purifier can do.

Who is this for?

A person that wants to stay healthy by breathing clean air would benefit from a filterless air purifier. Busy parents that do not want to be tied down with another home appliance and are tired of cleaning air filters. An asthmatic or hyperallergic person that is constantly sick due to dirty air. Newborn, baby, and children with developing immune systems. Lastly, anyone that is confused about whether to purchase an air purifier without any filter needs to read our reviews below.

2021 Best Filterless Air Purifier

NoImageAir PurifierOnline Price (Amazon)TechnologyFiltrationCoverageScore
1GermGuardian GG1100W Elite Pluggable UV-C SanitizerGermGuardian GG1100W/ GG1100B Air Purifier


UV-C Light1-stage56 sq. ft. (5 m2)3.5
2GermGuardian GG1000 Pluggable Air Purifier & SanitizerGermGuardian GG1000 Pluggable Air Purifier


UV-C Light1-stage56 sq. ft. (5 m2)3.5
3Airfree Lotus Air Purifier


Thermodynamic TSS1-stage650 sq. ft. (60 m2)4
4Airfree T800 Air Purifier


Thermodynamic TSS1-stage180 sq. ft. (17 m2)3.5
5Clarifion GL-139 Negative Ion GeneratorClarifion Negative Ion Generator GL-139 Air Purifier


Negative Ion Generator1-stage150 sq. ft. (14 m2)3.5
6Airfree Iris 3000Airfree Iris 3000 Air Purifier


Thermodynamic TSS1-stage650 sq. ft. (60 m2)4
7Airocide APS-300 Filterless Air PurifierAirocide APS-300 Air Purifier


PCO catalyst technology1-stage300 sq. ft. (28 m2)4
8Air Oasis G3 1000G3 UV Ionic Air PurifierAir Oasis 1000 G3 Air Purifier


Ionization Germicidal UVC3-stage300 sq. ft. (28 m2)4

How Do We Measure?

The "permanent" filtration First and foremost, the air cleaner must be filter free so if there are any filters that require replacing, it will not be featured on this list. Next, the main filtration can be reused over and over again without expiring. As such, Ionizer, UV-light, Electrostatic precipitator, heat sterilization, and Photocatalytic oxidation will all be considered except ozone generator. Any devices that use ozone to clean the air are straight off the list. We will measure the device's effectiveness against household allergens, smoke, fumes, and odors. The quicker it kills of the irritants, the more consideration weight we will place on the model.
Room size/ Coverage + Noise Level This one is a no-brainer. The larger the purifying coverage, the bigger the room size an air cleaner can cover. As most air purifiers without filters are not CADR tested, airflow delivery plays a key role here. The only "must" criteria is the noise level has to be silent throughout the entire operation.
Selling price Since filter replacement cost is nil, the selling price is a critical factor in deciding is this the "right" one. No point buying an expensive air purifying device that does not work or take years to recuperate. We will also judge the unit worthiness compared with a classic HEPA air cleaner.

Quick Summary

GermGuardian GG1100W Elite Pluggable UV-C SanitizerGermGuardian GG1000 Pluggable Air Purifier & Sanitizer
GermGuardian GG1100W/ GG1100B Air PurifierGermGuardian GG1000 Pluggable Air PurifierAirfree Lotus Air Purifier
UV-C LightUV-C LightThermodynamic TSS
Recommended Room Size
56 sq. ft. (5 m2)56 sq. ft. (5 m2)650 sq. ft. (60 m2)
3.5 ⭐ out of 53.5 ⭐ out of 54 ⭐ out of 5
Amazon Price

You can't have the best filterless silent UV air purifier without introducing a plug-in air sanitizer and deodorizer. A dependable technology that does not emit ozone and is great at removing bacteria, viruses, and mild household odors. GermGuardian GG1100 Elite is the updated version of the popular GG1000 and now it comes in 2 colors (black & white). At less than 40 dollars, it is very accessible that everyone could afford one.

A germ-killing, ozone-free, affordable UV-C air sanitizer that can be plug into a wall socket. Coverage is small so you will need multiple units to cover an entire home.

The modern and simplistic design is nicely balanced up with a LED circle ring that lets you know the UV sanitizer is working. With no complicated controls to operate, just plug GG1100 Elite into a wall socket and you are good to go. There's even a USB port where you can charge other devices while it is still sanitizing the air. Perfect for allergy sufferers that like to sleep with clean air.

Unlike a HEPA filter that heavily relies on a fan, the UV-C light filtration is noiseless and you will barely notice its existence when performing the air cleaning. Filter-free GermGuardian GG1100 Elite is also cheap to run as it uses very little energy with a 3.5 Watt bulb than a standard light bulb. We have a few units installed at home and have little impact on the electricity bills. The standard 120V/ 60Hz power voltage is safe to use around children or pets with no risk of burning. Being CARB compliant, you can safely leave it running the whole day when you're away on a trip.

Let's look into GermGuardian GG1100 Elite Pluggable UV-C sanitizer and deodorizer specification:

  • Purifying Technology - UV-C light with Titanium Dioxide
  • Dimension (W x H x D) / Weight - 6.75 x 6.75 x 3.5 in / 0.7 lb
  • Coverage Area - 56 sq. ft.
  • Energy Consumption - 3.5 watts
  • Noise level - Silent
  • Odor Absorbing - Yes
  • Ozone Free - Yes
  • Warranty - 1 year

The complete opposite of a conventional air purifier that uses multisets of filtration. GG1100 Elite relies solely on UV-C light with titanium dioxide. A century-old technology that uses short-wavelength UV-C to kill germs, bacteria, viruses, mold spores within minutes. When microorganisms are drawn into the chamber, the spectrum ultraviolet light will penetrate the protective wall and reduce the germs' DNA. The genetic structure of the bacteria and viruses will be altered thus disabling their ability to reproduce. The titanium dioxide act as a disinfectant that decomposes microorganisms via photocatalysis. This join purification process will continue until all irritants and odors-causing cells are destroyed. We highly recommend placing the no filter air purifier in the bathroom than relying on an air freshener.

At 6.75 x 6.75 x 3.5 inches and 0.7 pounds, GermGuardian GG1100 Elite Pluggable UV-C Sanitizer and Deodorizer fits perfectly in a handbag or luggage during travel. The non-filter setup means there is no messy filter washing or replacing needed. You will have to bear with the 15-30 dollars UV lightbulb running costs every 6-12 months (4,000-5,000 hours) for optimum performance. You will know the bulb is failing when it starts to flicker or change colors.

While GermGuardian GG1100 Elite takes up very little interior space as it is pluggable, there are some trade-offs to consider. GG1100 has a small 56 square feet coverage that you have to place it close to the pollutant sources e.g. next to the litter box, toilet bowl, diaper pail, or ventilation. Being a filter-free air purifier for small room, the filtration depth is very restricted so do not expect similar quality as a HEPA filter. There is also an estimated 15% reduction in efficiency after 4,000 hours of usage. If you understand the limitations, there's is absolutely no doubt this UV sanitizer will work well as intended.

In short: A germ-killing, ozone-free, affordable UV-C air sanitizer that can be plug into a wall socket. Coverage is small so you will need multiple units to cover an entire home.

online price**
±39.99 $/ 7

(annual filter cost ±15-30)


The older version to GG1100 with the exact same functionality in providing clean, fresh air. GermGuardian GG1000 Pluggable UV-C Sanitizer is many people's favorite go-to air purifier without filter. It is small, affordable with a distinctively sleek design. It is also very easy to use without any controls. At 3.2 x 7.5 x 3 inches in size and a mere 0.7 lb in weight, you will have no issue plugging it into any type of wall socket. Just leave it close to the contaminant sources and the UV air purifier will quietly clean the air.

A cheap and wall pluggable room sanitizer with UV-C light technology. Capable of eliminating close range germs and household odors.

GermGuardian GG1000 meets the strict standards set by the California Air Resources Board (CARB). You don't have to worry about the electricity bill as it uses less energy than a standard lightbulb. Out test units have been running for months and there are zero spikes on the electricity bills. The 120V/ 60Hz electricity is perfectly safe around children and pets. If you have a baby at home, installing multiple units around the house can safeguard the little one from falling sick due to airborne viruses.

Let's see what makes GermGuardian GG1000 Pluggable UVC Air Sanitizer & Odor Reducer ticks.

  • Purifying Technology - UV-C light with Titanium Dioxide
  • Dimension (W x H x D) / Weight - 3.2 x 7.5 x 3 in / 1.13 lb
  • Coverage Area - 56 sq. ft.
  • Energy Consumption - 3.5 watts
  • Noise level - Silent
  • Odor Absorbing - Yes
  • Ozone Free - Yes
  • Warranty - 1 year

Like GG1100, GermGuardian GG1000 filterless air purifier is powered by the safe and ozone-free ultraviolet light technology with titanium dioxide. The short-wavelength UV-C light destroys nucleic acids and disrupts microbes' DNA from reproduction. Titanium dioxide (TiO2) will further disinfect the germs, effectively killing it or causing it to be inactive. Bacteria, viruses, musty mold, smelly toilet, and diapers will be eliminated by the ultraviolet light for good.

Being a pluggable unit, GermGuardian GG1000 is flexible with the placement and is often utilized in hospitals, commercial buildings, offices. You can literally use it anyway as you please as long as it has a power source. Perfect for tight spaces like toilet, kitchen, laundry room, baby room, and walk-in wardrobe.

No cleaning is needed as there is no filter inside. Simply replace the UV-C light bulb when it reaches its 4,000-5,000 expected lifespans. We recommend changing the 3.5 watt lightbulb every 6 to 12 months or when the bulb starts flickering and changes colors. The bulb performance will degrade over time (approximately 15%) when it is reaching its end cycle.

There are two downsides you do have to take note of. First, the very limited purifying coverage (less than 60 square feet) means this is not a direct substitute for an air cleaner. Second, it is less effective against dust, hair, and other large airborne particles. Other than that, GermGuardian GG1000 Pluggable UVC Air Sanitizer & Odor Reducer is worry-free and maintenance-free. If you plan to have only one filter-free air purifier in your home, Airfree models would be the better choice.

In short: A cheap and wall pluggable room sanitizer with UV-C light technology. Capable of eliminating close range germs and household odors.

online price**
±59.99 $/ 7

(annual filter cost ±15-30)


Airfree Lotus is our favorite no filter air purifier in this list. That's right, this European made, filter-free machine comes with a unique resemblance of a beautiful Lotus flower petal. At 7.7 x 13 x 7.7 in dimension and 3.3 pounds, it is very small and operates silently since there is no huge fan involved. For comparison, a typical mechanical air cleaner is 2 times as bulky and heavy.

A reliable, filter-free air purifier that can kill mold and germs silently while you sleep. Suitable for asthma and allergy sufferers.

Between the lines, there is 10 pleasing multi-color light from Red, Rose, Violet, Blue, Light Blue, Green, Yellow, Orange, Brown, and Grey. Perfect for home decor or a family that has children sleeping in their own room. The adjustable light will give them a sense of security and help them navigate through the dark.

Below is the highlight of Airfree Lotus specification:

  • Purifying Technology - Thermodynamic TSS Technology
  • Dimension (W x H x D) / Weight - 7.7 x 13 x 7.7 in / 3.3 lb
  • Coverage Area - 650 sq. ft.
  • Energy Consumption - 52 watts
  • Noise level - Silent
  • Odor Absorbing - Yes
  • Ozone Free - Yes
  • Warranty - 2 years

Focusing on Airfree's patented and environmentally friendly Thermodynamic TSS Technology. Drawing 14,000 to 20,000 liters of air hourly into its chamber, Airfree Lotus will boil up the air to 400°F. The sterilization will instantaneously kill 99.99% of microorganisms like pet dander, pollen, mold, dust mites, tobacco, odors, bacteria, and viruses. Even harmful ozone also can be removed. When the air is completely purified, clean air will be cool down internally and release back out at normal room temperature.

The entire purification process is completely silent and requires no maintenance and filter. All you have to do is switch on the device and the machine will automatically clean the air. After 24 hours of non-stop operation, Airfree Lotus can cover room space up to 650 square feet. You will enjoy breathing fresh air so long the machine is kept on.

There are other perks of Airfree Lotus besides being the best silent filterless air purifier. It is very economical as there is no filter change or washing needed. The 110-127 voltage and 52 watts energy usage are no the lowest but still manageable. Perhaps the most critical factor of all, there is no ions and ozone emission during the entire purification. Thermodynamic TSS technology is certified on its safeness with Thermistor safety sensors, thermal fuse, tilt sensor, varistor, and current limiting fuse.

There are some minor complaints to ponder on. It does not capture dust or any large particles quickly enough. To ensure consistent performance, Airfree Lotus must be turned on at all times. Pricing is slightly steep for a filterless air purifier. Lastly, the machine does feel warm after long hours of operation. Nevertheless, you can use it around children or pets without having to worry that the device will topple over and cause burn damage.

In short: A reliable, filter-free air purifier that can kill mold and germs silently while you sleep. Suitable for asthma and allergy sufferers.

online price**
±399.00 $$$$$/ 7

(annual filter cost ±0)


The cheapest, no fancy design, cylinder shape air cleaner without the use of any filter. Airfree T800 is powered by the same Thermodynamic TSS that can be found in other more expensive Airfree models. A patented filter-free technology that produces no ions, reusable, and can even reduce harmful ozone levels.

The smallest and lightest Airfree air cleaner with no filter. It is also the most affordable Thermodynamic TSS but with a smaller coverage and dated design.

Compactness and portability is the key selling point. Comes in at a thin 6.1 inch diameter, 12 inch height, and a mere 1.5 lb weight. Airfree T800 well-sealed, slim compressed size is achievable due to the filterless setup. We have no issue finding a place to fit T800 in our interior space. Just turn it on and you can leave it for days without making any adjustment. A great natural solution for people suffering from respiratory allergies.

Here is the key specification of Airfree T800.

  • Purifying Technology - Thermodynamic TSS Technology
  • Dimension (W x H x D) / Weight - 6.1 x 12 x 6.1 in / 1.5 lb
  • Coverage Area - 180 sq. ft.
  • Energy Consumption - 33 watts
  • Noise level - Silent
  • Odor Absorbing - Yes
  • Ozone Free - Yes
  • Warranty - 2 years

Unlike a mechanical filter that traps airborne irritants, Airfree T800 can eliminate 99.99% allergens permanently through heat similar to boiling water. When air filled with contaminants is drawn inside the core, the inner mini-ducts heats the air over 400°F, sterilizing any organic allergens and odors like mold, pollen, dust mites, bacteria, viruses, pollens, and pet dander within minutes. The heated, purified air will be cool down in the machine, leaving only clean air out at normal temperature. The purification process will also reduce ozone in the air by 26% according to an independent lab test in Sweden. You should experience a surreal difference in air quality after running for a couple of hours. Being half the price of most Airfree models, you can get more than 1 unit and place in multiple locations for more comprehensive room coverage.

Airfree T800 is proven to be safe for pets and children, maintenance-free, and eco-friendly from its filter-free setup. It operates silently in the background and will not disrupt your day to day life. Ideal for night use where you can place it next to your bed or office desk, kitchen, baby room that could do with the serenity. While Airfree T800 might not be as effective as a HEPA filter, it is cost-efficient that uses very little electricity at 33 watts. With no filter cost, You will save a lot of money and time in the long-run.

Due to the low cost, Airfree T800 shares a few noticeable downsides. First, it does not have a nightlight that can enhance the room decor. The recommended 180 square feet purifying coverage is relatively small. It is not great against large particulate matters and can topple when you're not careful. Then again, Airfree T800 will kill germs, bacteria, and viruses similar to its big brother at a fraction of a cost. What else could you ask for more?

In short: The smallest and lightest Airfree air cleaner with no filter. It is also the most affordable Thermodynamic TSS but with a smaller coverage and dated design.

online price**
±99.00 $$/ 7

(annual filter cost ±0)


The only pluggable, ionizer air purifier without a filter in the list. Clarifion GL-139 Negative Ion Generator is maintenance-free with no recurring cost. Just pay for the one-off fee and you can reuse it again and again without fail. There are absolutely no replacement parts needed for the purification.

A cheap air ionizer that does not need any maintenance or filter change. The coverage area is small but expected given its pluggable compact form.

Mini but mighty, at a small 4 inches width and 6 inches in height, GL-139 fitts steadily well on homes with a standard wall socket. Adding the light 4.8 lb weight, you could bring the ultra-compact air ionizer during trips and plug it in a hotel or guest room.

Clarifion GL-139 is super easy to use and operate. Being a plug and play filter-free air cleaner, there are no complicated controls to worry about. You can tell if the negative ion generator is working with the glowing blue LED light.

The ionization cycle uses very little electricity (less than 1 watt) even if you are running all day every day. The ultra-quiet noise output is perfect for home air quality improvement in the baby room, workstation, kitchen, living room, dining room, garage, or bathroom.

Here's the key specification of Clarifion GL-139:

  • Purifying Technology - Negative Ion Generator
  • Dimension (W x H x D) - 4 x 6 x 2.9 in
  • Weight - 4.8 lb
  • Coverage Area - < 54 sq. ft.
  • Energy Consumption - Very low
  • Noise level - Silent
  • Odor Absorbing - Yes
  • Ozone Free - Negligible amount (EPA standard)
  • Warranty - 1 year

Clarifion GL-139 focuses solely on ionization technology that will disperse up to 10 Million pcs/cm^3 of Negative Ion-Output. By leaving the ionic filterless air purifier run autonomously, millions of negative ions will be diffused into the air. The charged ions will then latch on to nearby lingering positive ions contaminants. Merged particles will drop due to the increased weight, leaving the air free of pollutants. You will then have to perform vacuuming to clean out the fallen particles. Otherwise, the particles will be stuck on the wall, sofa, table, floor until it is cleaned or stirs back up in the air.

A 100% ozone-free and safe technology, Clarifion GL-139 will cover up to 150 square feet of room space. Just make sure it is at least 5 feet from the ground and the airflow is not impeded by furniture or any household items.

The drawback for Clarifion GL-139 Negative Ion Generator? Like all pluggable air cleaner with a tiny form factor, it has limited purification. The air ionizer technically doesn't remove any airborne contaminants in the room and is also not the best against smoke and odors. If those are your concern, a UV sanitizer will probably suit you better.

In short: A cheap air ionizer that does not need any maintenance or filter change. The coverage area is small but expected given its pluggable compact form.

online price**
±39.99 $/ 7

(annual filter cost ±0)


Airfree Iris 3000 is a beautiful, black housing air purifier that destroys allergens and odors without any filter. Made in Europe with ISO 17025, this compact bullet head design has a diameter of 8.4 inches and a height of 10.4 inches. At only 3.3 pounds, the build quality is top-notch with no signs of off-gassing. You can place it on top of a cabinet or table for days without being too obtrusive.

Sterilizer/ air purifier with zero noise output and supports up to 650 square footage of room space. No filter change or maintenance needed.

Airfree Iris 3000 also have the added advantage of not having to replace the filters or lightbulb. Just turn it on and let the TSS Technology slowly and quietly purify the air. Unlike air fresheners that mask away any unpleasant smell, Airfree Iris 3000 can get rid of foul odors coming from microorganisms. Ideal for a person with hypersensitivity especially to chemicals.

Let us look into Airfree Iris 3000 filterless technology specification:

  • Purifying Technology - Patented Thermodynamic TSS Technology
  • Dimension (W x H x D) / Weight - 8.4 x 10.4 x 8.4 in / 3.3 lb
  • Coverage Area - 650 sq. ft.
  • Energy Consumption - 52 watts
  • Noise level - Silent
  • Odor Absorbing - Yes
  • Ozone Free - Yes
  • Warranty - 2 years

Airfree Iris 3000 Thermodynamic TSS Technology applies the concept of boiling water (sterilization). With 14,000 to 20,000 liters of air passing through hourly through natural convection, the mini-ducts will heat up the air over 400 degrees Fahrenheit. The exceedingly high temperature will eliminate 99.99% tobacco smoke, mold, pollen, bacteria, and viruses at a fraction of a second. The now purified air will be cool down for a couple of minutes and distribute out silently at room temperature. Great for bedroom, living hall, workplace, and baby room as you can barely hear any noise coming from the filter-free air purifier.

Even though the unit can get hot after running for a few hours, it will not increase the room temperature in any way. This filterless purification process is certified to be safe with built-in thermistor safety sensors, thermal fuse, tilt sensor, varistor, and current limiting fuse. Airfree Iris 3000 will not release toxic ozone gases that can trigger asthma and destroy tissue cells in the lungs. In fact, Airfree Onix 3000 can prevent mold and reduce ozone by 26% as tested in Sweden's laboratories.

There's a lot of similarities between Airfree Iris 3000 with Lotus like the no filter purification, one-button operation, and wide 650 square feet capacity. The 10 adjustable multicolor lights range from Red, Rose, Violet, Blue, Light Blue, Green, Yellow, Orange, Brown, and Grey. Power consumption is at 52 watts that is somewhat efficient given it is a device that uses a heating element.

Performance-wise, it's no HEPA grade but that's the beauty of it. It is a filter-free air purifier so no costly filter replacement ever. If you don't mind the slow purification that takes days to cover an entire room, there are other mirroring models e.g. Iris 3000, P3000, P2000.

In short: Sterilizer/ air purifier with zero noise output and supports up to 650 square footage of room space. No filter change or maintenance needed.

online price**
±329.00 $$$$/ 7

(annual filter cost ±0)


Airocide APS-300 is the best filterless air purifier with NASA developed PCO catalyst. The same purification technology used to keep the air safe for astronauts in the International Space Station and the Columbia shuttle. Being the successor model to APS-200 model, award winning APS-300 receives major upgrades in performance and design. The new cutting-edge design incorporates metal and wooden trim well with a neutral white color bezel. It will complement nicely any modern home decor without sacrificing usability.

The best filterless PCO air purifier with NASA developed technology. Expensive but proven to be safe and effective in eradicating carbon-based pollutants.

At only 9 pounds in weight and 6.9 x 18.7 x 6 inches in size, APS-300 barely takes up any space and fits nicely on a desk, table stand, or top of a cabinet. You can place the air cleaner straight up, lying down, or even mount it to a wall and it will still work fine.

As for controls, you have 3 easy to use buttons which is low, high, and auto. By default, the air purifier will start with high speed setting to ensure there is the right amount of clean air disbursed (Coanda effect). You should leave it in Auto mode as the fan will always run on high and only switch to low speed when the room turns dark via the built-in light sensor. Perfect to keep noise level down when you are trying to get a good night sleep.

Let's look into the facts why Airocide APS-300 can help allergy and asthma sufferers:

  • Purifying Technology - PCO catalyst technology
  • Dimension (W x H x D) / Weight - 6.9 x 18.7 x 6 in / 9 lb
  • Coverage Area - 300 sq. ft.
  • Energy Consumption - 60 watts
  • Noise level - Silent
  • Odor Absorbing - Yes
  • Ozone Free - Yes
  • Warranty - 2 - 5 years

A Class 2 medical device clear by FDA and CARB compliance. In 2018, Airocide APS-300 filterless air purifier receive a significant upgrade with 2 advanced filter technologies. Photocatalytic Oxidation (PCO) is very effective in eliminating airborne pathogens and toxic fumes. The internal fan will draw air into the hollow glass tube coated with a catalyst. Through the process of oxidation, PM 2.5, bacteria, germs, mold spores, pollen, VOCs, benzene, formaldehyde, and ethylene will be eliminated for good. Best of all, there is zero ozone emission or harmful byproducts produced. Titanium Dioxide (TiO2) is very safe and stable as the free oxidizers will not travel too far from the catalyst surface. After all, it is a technology used in a sealed spacecraft.

Airocide APS-300 can cover up to 300 square feet of room space with no filter. To ensure an optimal result, you will have to replace the reaction chambers cartridge every 12 to 15 months depending on the usage and air quality. The cartridge change is easy and it only takes 30 seconds by removing the grill plate.

For more than 2 decades, Airocide APS-300 are used in hospitals, nursery homes, and health care facilities all over the world. It is used in food processors, grocery stores to keep fruits like avocados, mangoes, berries fresh and protect pre-mature ripening or rot due to high VOCs concentration level. Well-known winemakers also used Airocide APS-300 to keep mold from growing on the wine barrels which can be a costly loss.

Airocide APS-300 is quiet, effective, and energy-efficient (max 60 watts) if you leave it in Auto mode. Standard 2 years warranty comes with an extended option to 5 years. There's even an industry-leading 60 days 100% satisfaction money-back guarantee if you are not happy with the purchase.

The downsides to this NASA air purifier is the selling price. At around 999 excluding any discount, there are other more affordable filter-free air purifiers in the market. Another thing is the reaction chambers cartridge replacement cost around 100+ dollars annually. Still, it is comparatively cheaper than a multi-stage HEPA filtration set. If you want the most advanced filterless technology to remove VOCs, you can never go wrong with Airocide APS-300.

In short: The best filterless PCO air purifier with NASA developed technology. Expensive but proven to be safe and effective in eradicating carbon-based pollutants.

online price**
±999.00 $$$$$$$/ 7

(annual filter cost ±111-139)


A portable, UV ionic surface sanitize that can improve indoor air quality and respiratory system. Air Oasis 1000G3 is the pioneer to incorporate NASA developed PCO technology into a compact home air purifier. A virtually maintenance-free, filter-free technology that can clean the air from allergy-causing pathogen and bio-contaminants .

An ionic photocatalyst air purifier that can eliminate a broad range of aerial irritants. The light cell needs replacing every 2 years.

From the exterior, you can tell Air Oasis 1000G3 UV Ionic Air Purifier is nicely built with an elegant and modern design. The anodized brushed aluminum & polymers elevate the premium feel without adding much weight to the body. The no filter setup allows a much smaller body and takes up very little interior space. At a mere 14.1 inches in height, 4 inches in diameter, and 6 pounds of weight, moving the Air Oasis around is a breeze can you can place it anywhere in the room.

For this latest version, the noise insulation has been improved (30 dB) despite having better air filtration. You can use it in the bedroom quietly for days without maintaining it. Don't worry about energy usage as it only used 15 watts of electricity hourly. We been running it for months and have not noticed a spike in our electric bills.

Here is the key specification of Air Oasis 1000G3:

  • Purifying Technology - Advanced Ionization Germicidal UVC Technology
  • Dimension (W x H x D) / Weight - 4 x 14.1 x 4 in / 6 lb
  • Coverage Area - 300 sq. ft.
  • Energy Consumption - 15 watts
  • Noise level - 30 dB
  • Odor Absorbing - Yes
  • Ozone Free - Negligible 0.04 PPM (parts per million)
  • Warranty - Lifetime

Inside the heart of the filterless UV Ionic air purifier is the 3 advanced powerful technologies experimented with by Einstein and NASA. The enhanced version, patent-pending advanced hydrated photocatalytic oxidation (AHPCO) with germicidal UVC. By converting water vapor into decontaminating ions through AHPCO catalyst, the broad-spectrum UV light will create oxidizers to neutralize up to 99% of bacteria, viruses, H1N1, mold, Mycotoxins, MRSA, VOCs, Legionella pneumophila, Aeroallergens, Formaldehyde, and odors to trace levels. The remaining oxidizers will gradually convert back into harmless oxygen and hydrogen. Bi-polar ionization will disperse millions of ions into the air and break down particles on a molecular level. Air Oasis G3 can also address mold issues that can lead to chronic mold-related illnesses like chronic coughing, sneezing, COPD, CIRS, Pulmonary edema.

Combining ionization and AHPCO Technologies, Air Oasis 1000G3 can help relieve allergies from seasonal hay fever, ragweed, mold, and pets. With an impressive 300 square feet purifying coverage, you can find G3 in the residential and commercial ground including contaminated basement, schools, offices, hospitals, salons, pet clinics, and government agencies.

No other PCO air purifier can compete with Air Oasis 1000G3 filterless air ionizer and surface sanitizer. The diffused oxidizers are 100% safe and ozone output is less than 0.05 PPM (EPA standard). Functionality is simple and straightforward that can be a good thing for some people. The lifetime warranty is the perfect icing to the cake that covers everything except for the cell and movable parts.

Air Oasis G3 is very well-priced with the lowest range 1000G3 at 399 dollars, larger room 600 sq. ft. 3000G3 at 499, and most powerful 900 sq. ft. 3000XG3 at 549. You can even upgrade to a nano induct whole-house photocatalytic air purifier that is mounted on the ducts of HVAC system. We recommend going for this particular model and only opt for the upgrade after you have tried one.

There are few minor cons with Air Oasis 1000G3 to go through. The replacement cell will cost you around 90 dollars annually. The lack of sensor, auto mode, and timer is an apparent cut-cost measure. Against dust and other large particles, it is not on the same par as HEPA air cleaner. Finally, the limited availability can be annoying where not all major retailers carry the brand. Still, if you want an ionic surface sanitizer air purifier with proven safety records, why not give Air Oasis 1000G3 a shot.

In short: An ionic photocatalyst air purifier that can eliminate a broad range of aerial irritants. The light cell needs replacing every 2 years.

online price**
±399.00 $$$$$/ 7

(annual filter cost ±90)

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


Other Alternative Options To Consider

Envion Ionic Pro Turbo
Envion Ionic Pro Turbo

A good, silent, and inexpensive model that is either discontinued or out of stock. Envion Ionic Pro Turbo is a sleek tower design air purifier for a large room up to 500 sq. ft. of space. With the overall 7.5 x 28.5 x 9.5 inches in size and 7.8 pounds, you can easily carry the machine from room to room that requires air purifying. At less than 150, you will get an Oxygen Plus filter technology that turns toxic smog and ozone into pure oxygen. Additionally, the Ionic purification with germicidal chamber sanitizes 99.9% of airborne irritants and odors. Powering the filtration is an easy to clean front-loading collection blades with 3 fan speed and clean filter indicator. Take note that Envion Ionic Pro Turbo is not completely filter-free. There is a "forever" permanent filter that is washable and reusable to help you save a lot of money in the long-run.

LightAir IonFlow 2.0

A fan-free, award-winning ionic filterless air purifier that is too expensive to recommend. LightAir IonFlow transparent base with the discreet light body is sleek and modern without given up on its functionality. Regardless if you go with LightAir IonFlow 2.0 Signature, Style, Evolution, Surface, or Solution, all models come with the same IonFlow technology. A scientific proven and evolutionary technology that can effectively remove all types of nano particles below 0.1 microns without filter. By generating 50 billion electrons per second, the transformed negative ions will attract other ions in the air. Hazardous pollutants like smoke, bacteria, influenza virus, pet allergen will be attracted to the charged collector leaving the air clean and healthy. No ozone is produced and the entire purification is very silent at less than 5 dB. It is also environmentally friendly since the energy usage is only 7 watts per hour. The cheaper IonFlow 2.0 Evolution and Style will set you back around $479 with 540 sq. ft. coverage while the top of the line signature will be at $549 at 650 sq. ft. coverage. Drawback is the reduced effectiveness against larger particles between 1.0 to 25.0 microns thus the collector plate will fill up quickly.

IonPacific ionbox 20m

A flagship negative ion generator from IonPacific that does not use any filter to provide clean, fresh air. At only 6.1 x 4.4 x 2 inches and 4.8 ounces weight, this lightweight IonPacific ionbox 20m air cleaner is ideal for home use and workplace. The versatile form factor allows you to effortlessly bring it for travel and plug it into a 110V/220V power socket or standard USB outlet. Right at the core, the breakthrough ionizing technology emits up to 20 million negative ions per second. Negative ions are natural phenomena that are safe, tested, and backed by many scientific studies. Compared with other small ionizers in the market, ionbox 20m patented ionizer is capable of outputting 10 to 20 times more ions. Even with the strong power output, the multi-power supply is very energy-efficient running at a low 1.5 watts. The only setback is the selling price where you will have to pay 2-3 times more than other filterless ionizers. Still, it is a one-time fee with zero maintenance or expensive filter replacement to worry about.

How Does A Filterless Air Purifier Works

As the name implied, a filterless air cleaner will purify the air without relying on any filter. Depends on the technology, a filter-free air purifier can cover a wide range of indoor pollutants like a normal HEPA filter would. There are 6 types of air cleaners that work differently to ensure you are breathing into clean, healthy air. One of those is the forbidden fruit that you should never go for.

  • Electrostatic precipitator - Remove pollutants in the air by inducing high-voltage electrostatic charges. The Electrostatically charged negative ions will merge with positive ions particles causing it to fall due to the increased weight. A collector plate will accumulate the dropped particles for easy cleaning.
  • Ionization – Like electrostatic precipitators, generate negative ions that neutralize pollutants but without an additional collector plate. You will need to vacuum, sweep, and mop the house to remove the fallen particles.
  • Thermodynamic sterilization - Similar concept to boiling water that kills 99.9% of microorganisms and germs through high temperatures. The sterilization process end and only normal temperature air are released back out.
  • Ultraviolet UV cleaner - Sterilization method that uses UV-C rays to damage the molecular structure of microorganisms. The allergens are obliterated inside the device therefore no cleaning is needed.
  • Photocatalytic oxidation - AKA Photocatalyst or PCO machine developed by NASA. PCO accelerates the natural decomposition of pollutants into harmless compounds. Through the process of photocatalytic, the broad-spectrum UV light will react to titanium dioxide resulting in oxidization. Photocatalyst is 100% safe, will eliminate bacteria and viruses, but the efficiency will degrade over time.
  • Ozone generator - This is the forbidden one we talked about. Ozone generator works by emitting millions of hazardous ozone in the air. It split oxygen molecules (O2) into single atoms, eliminating any contaminants in between. The single atoms will merge with other oxygen molecules to form ozone (O3). Ozone generator will neutralize strong odor but is harmful to our body. Inhaling to ozone can lead to many side effects and respiratory problems.

What Are The Benefits of Filterless Air Purifiers?

There are many reasons to own a filter free air cleaning machine. Besides being capable of cleaning indoor air 24 hours a day, there are some perks that are only available in an air cleaner with no filter. To assist you in making an informed buying decision, here are the key benefits of why one should invest in a filterless air purifier.

  • Affordable price range even for the top tier model.
  • No recurring cost as it does not use any filters.
  • Consistent and reliable air purifying performance.
  • Save you a lot of time as no maintenance is needed.
  • Energy-efficient where it uses very little electricity.
  • Noiseless operation or soft white noise.
  • Sleek, compact, and lightweight body.
  • Very easy to operate with simple controls.
  • Safe to use around children.

Is It Safe To Leave A Filter Free Air Purifier On All The Time?

A filterless air purifier is perfectly safe to run 24 hours a day without shutting down. It is designed to do so to prevent airborne contaminants like dust, bacteria, and viruses from building up. Just turn on the device, go on with your day and let the machine do the air cleaning.

Are Filterless Air Purifiers Safe To Use Around Children And Pets?

A filterless air purifier is safe to use around babies, children, and pets providing it is not an ozone generator. Even models like Airfree that uses thermodynamic sterilization (heat) will not cause any burn damage. Most models are very compact too so there is less hazard risk of the device topple and knock on the little one.


Filter VS Filterless Air Purifiers: Which To Pick?

There are key differences between the two that you should know before making a purchase. Here are the advantages of getting a filterless over a filter-enabled air purifier.

  • Filterless air purifier is cheaper (one-time fee) as there is no filter to replace VS a HEPA air cleaner that costs hundreds of dollars with high recurring costs.
  • Filterless air purifier is easy to use as it requires zero maintenance. You could leave it unattended all day to eliminate bad air. A mechanical air cleaner will require regular filter change as it is prone to dust and dirt. For air purifiers that come with a washable filter, you will need to regularly remove the filter for cleaning which can be time-consuming.
  • Complete silent operation compared with filter-based air cleaners that generate lots of noise from the spinning fan.
  • Sleeker design than the filter-based counterpart as it does not have to incorporate filters in the body.

Here are the disadvantages of getting a filterless over a filter-enabled air purifier.

  • Limited pool of options for a filterless compared with the vast selection of filter-based models.
  • In general, filter-enabled air cleaners can support a much wider room size all the way up to 4,000 square feet. This is due to the physicality of the HEPA filter and a larger motor fan.
  • Most filterless models are NOT certified by the Association of Home Appliance Manufacturers (AHAM).
  • No filter air cleaners are active and use a single filtration to eliminate bad air. Mechanical air purifiers are passive that use multiple filtrations to pull air inside its chamber to cleanse the air.
  • Conventional filter-enabled models have better filtration performance than a filterless air purifier. A HEPA filter is more effective in dealing with fine particles while a carbon filter is better in removing smoke and odors. Best suited for those suffering from severe allergies, breathing problems like asthma.

In conclusion, filterless air purifier pros outweigh the cons thus it is a better choice if you don't need the absolute best filtration.

Will Heat Sterilization Increase The Room Temperature?

Heat sterilization will not heat up the room temperature despite performing the sterilization at around 250°F (121°C) to 270°F (132°C) degrees. This is because the heated air will be cool down inside the core before releasing clean air out. The device might feel warm when touched, but in no way the heat will be transferred out. Nevertheless, you should keep it away from children reach.

How Do I Choose A Filter Free Air Purifier Based On My Room Size?

Choose a model with the coverage area equal to or exceed the square footage of your room size. For example, if you need the device to work in a 300 square feet room, pick a model that can cover at least 300 square feet of space. Since filterless air cleaners are not under AHAM CADR, you will need to rely on the official figures from the manufacturer.

To calculate your room size in square footage, just multiply the length and the width of the room. E.g. length 20 feet x width 20 feet = 400 square feet.

Do Filterless Air Purifier Release Ozone?

Filterless air purifiers will not release ozone unless you account for an ozone generator. Ozone generator or Ozonator is a device that produces ozone that is harmful to our health especially our lungs. It breaks apart oxygen molecules in the air into single atoms, then merges with other oxygen molecules to form ozone. Because ozone is an unstable compound, it can react badly with other toxic chemicals found in a household like VOCs, cigarette smoke. None of the filter-free air cleaners listed here is ozone generator as we do not advocate owning one.

Is Ionization And UV-C Light Safe?

Ionization, UV-C light is safe to use and will post no threats to human health risk. It is a proven technology that has been used for decades commercially and residentially. UV device uses ultraviolet rays to safely kill bacteria and viruses inside the chamber. Avoid direct exposure to UV-C light as it can damage skin cells. Ionizer produces natural negative ions to remove airborne irritants. Most people often confuse ionizer as an ozone generator which is a totally different set of technology. A true ionizer does not generate ozone to "purify" the air.

Why Filterless Air Purifier Does Not Conduct ACH Or CADR Ratings?

Both ACH and CADR are only applicable to air cleaners with a filter and fan to draw air in. Filterless air purifier technology relies on heat, ultraviolet light, or ionizer to purify the air. CADR (Clean Air Delivery Rate) measures the volume of clean air in CFM (cubic feet per minute) at fixed room size. 3 tests will be conducted separately for different ratings: dust, pollen, and smoke. It does not measure how many microorganisms have been killed in the process thus no CADR ratings will be given. ACPH or ACH is the abbreviation for Air Changes per Hour. A metric that measures how many times the air purifier exchanged the air from a space.

Does Filterless Air Purifier Remove Odor?

Air purifier without filter does remove odors from mold, pets, toilet, cooking, and chemicals like tobacco smoke, cleaning agents, VOCs, CO. It is less effective than a carbon filter that can absorb all types of smoke particles and odors. If your home is plagued with a musty, obnoxious smell all-year-round, there's no harm trying it out.

What To Look For In a Filterless Air Purifier

There are not many 100% filter free air cleaners in the market. Most models come in a hybrid form that has at least one reusable filter. If you already set your heart on one, here are some great features you should take into account when buying a filterless air purifier. The more knowledge you have of a product, the better decision you will make.

  • Particle Removal Capacity - The airflow effectiveness of the filterless air purifier in removing airborne particles. Look for a model that is capable of removing at least 99 percent of the contaminants.
  • Modes of Operation (fan speed) - Most filterless air cleaners utilize a one-touch operation that runs on one mode. Others come with standard 3 fan speed mode: low, medium, high. Advanced models have built-in sensors for autonomous operation.
  • Coverage area - The greater the coverage, the more clean air it can distribute. Measure the room size you need will make a big difference. Some models can only cater to small spaces while others can cover up more than 1,000 square feet. For example, if you intend to place the device in a 300 sq. ft. room space, pick a model that can handle at least the minimum range.
  • Purifying technologies - Depending on the nature of the contaminants, choose from ultraviolet light, negative ion generators, or Thermodynamic TSS Purification Technology. The technology chosen will electrochemically remove particles and purify indoor air.
  • Dimension - If you are staying in limited room space, it makes sense to choose a portable air cleaner over a bulky one. Most air purifiers with no filter are compact and lightweight compared with a HEPA device. Some models even come in a pluggable form that you can plug it into the wall or bring it around for travel.
  • Noise output - The best perks of owning a filter-free air cleaner is the noiseless operation that will not distract you from sleep or work. Ideal for workspace, bedroom, nursery room, or anywhere you need to stay focus. Pick a model that has a noise level less than 30 dB for minimal distraction.
  • Energy consumption - The more powerful the airflow, the more energy is needed. That said, most no filter air purifiers consume little energy due to the non-dependable of a conventional motor fan. You can easily tell if a model is energy-efficient with the Energy Star label printed on the box.
  • Warranty - Try to look for a model that offers more than 1-year warranty. The longer the period, the better assurance you will get from the manufacturer. It will give you peace of mind during the course of ownership and protection against power fluctuations. Also, consider the service center location and what parts does the warranty cover. Pay close attention to brands with notoriously bad track records.
  • Other features - In order to stand out among the crowd, most manufacturers will add extra features to improve the usability of their product. Features like a night light, timer, LCD display, or mood light is worth ponder upon if you don't mind the increase in pricing.

Max Fernandez

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