Alen Air Purifiers Review

Alen Air Purifiers Review [Ultimate Guide]

With a tagline "Pure Air for Life", Alen air purifiers are known for its sturdy build quality, wide purifying coverage and personalizable cover. In this Ultimate Guide we will be looking at the latest Alen air purifiers features, design, purifying coverage, technology, filters and of course cost of ownership. Under the same section you can also check out each air purifiers detail specification plus what we like/ don't like about it. Ultimately if you have decided or still considering Alen air purifier as a whole, this guide should give you a clear indication on your next step.

About Alen Review

At Alen, our team is driven to help you and your loved ones live your best by researching and developing thoughtfully designed and highly effective air purifying solutions that transform indoor environments. Customizable and comprehensive solutions that make it easy to select the best option for your needs, with air purifiers and filters that are simple to use and easy to maintain. Smart solutions for now. And for the future. Smart solutions that adapt as you do. That transform your life.

Source: Alen's official site

Getting to know Alen

Dimension, Weight and features All Alen air purifiers that are currently available is either in tower form size or conventional type ranging between medium to large size. Product weight is typically between 9 - 21 lb with tower air purifiers accountable for the lighter weight. What's standard from newer Alen air purifiers is the famous Lifetime Limited Warranty that covers your air purifier for life, 60 days guaranteed, pre-filter, 4 types of HEPA filter (more on that later), Ionizer, 3 - 4 fanspeed, filter change indicator (higher range models gets Smart Filter Light), timer, back handle, personalizable designer panel/ multiple color option and ENERGY STAR rated. Most models also gets SmartSensor, Air quality status and Auto/ Sleep mode.
Warranty and after-service support Alen air purifier comes with industry's first and only Lifetime Limited Warranty which cover the air purifier from defects in materials or workmanship for as long as you own it. Please note the Lifetime Warranty is only applicable in U.S. and Mexico. On to after-service support, besides the standard phone call, email enquiries, there is also Alen Expert live chat via its official site.

Filters and Technologies

Filters and Annual filter replacement cost All Alen air purifiers comes with 3-stage filtration with optional HEPA filter upgrade. For dust, hair and other large pollutants, you have the permanent and washable Pre-filter standing by. HEPA filter would capture smaller micron size particles and by default most air purifier comes with HEPA-Pure filter (dust and allergens). Optional upgrade includes HEPA-Silver (Bacteria and Germs), HEPA-OdorCell (Smoke and Heavy Odors) and HEPA-FreshPlus (Chemicals and VOCs). Last stage Ionizer would ensure all airborne pollutants would be captured or dropped to the floor. On to annual filter replacement cost, expect $44 - 138 price range varies on filter type and lifespan. BreatheSmart series filter lifespan is at an average of 6 - 18 months while tower air purifier is at an average of 6 - 12 months.
WhisperMax technology Help keeps the motor fanspeed volume down with precise tuning and aerodynamics.
Smart Filter Light Calculate filter lifespan based on usage and surrounding environment air quality.

Overall airflow performance

Purifying coverage, Airflow, Fanspeed and CADR The current list of Alen air purifiers lineup has wide purifying coverage for large area between (500 up to 1100 sq. ft. and strong airflow delivery rate between 28 - 286 cfm. Based on the purifying radius all Alen air purifiers would cover space area from bedroom, living hall, basement, meeting room,garage and kitchen. Almost Alen air purifiers comes with 4 fanspeed for better airflow management while CADR tested by ENERGY STAR sit between 114 (Paralda) to 300 cfm (BreatheSmart).
Noise level and Power consumption In general Alen air purifier (42 - 56 dB) noise level is not the most subtle at low speed but moving up the noise level is perfectly bearable even for normal conversation. As for power consumption, its averaging between 30 - 105 W, again not the lowest but on normal operation between 2 - 3 speed, it's considerably cost-efficient given its optimal airflow delivery rate and applicable area. Most Alen air purifiers also comes with Auto mode which works well in managing the air purifier power usage.

Complete list of Alen air purifier reviewed

In no particular order, here is our most recent list of Alen reviews: Alen A375,  Alen Paralda,  Alen BreatheSmart FIT50,  Alen BreatheSmart FLEX,  Alen BreatheSmart Classic,  Alen T100,  Alen BreatheSmart 75i,  Alen BreatheSmart 45i, 

Which Alen air purifier to go for?

Thanks to the changeable front panel cover. Alen BreatheSmart  is still a refreshing model even though its been in the market for number of years. On first look it's very hard to tell apart between the other BreatheSmart model, Alen BreatheSmart stands top-of-the-line externally and internally with large body  to accommodate its outstanding filtration. Underneath the "hood", Alen BreatheSmart superb 1100 sq. ft. purifying range and consistent airflow distribution is the best in BreatheSmart  series and one of the best in the large purifying group. Features wise is very generous besides the 3-stage filtration (Pre-filter, selected HEPA filter and Ionizer), 4 fanspeed with Auto mode, Smart Filter Light filter replacement indicator, child-lock, ENERGY STAR rated and Lifetime warranty.

What is the cons? Not much beside the expensive list price, typical loud noise at high speed and lacks dedicated carbon filter option. If you are going with this model, we recommend upgrading the filter to HEPA-OdorCell or HEPA-FreshPlus to cover smoke and odors based pollutants.
  • Plenty of swappable wood trim front cover design.
  • Wide purifying coverage, superior airflow delivery rate and highly adjustable (up to 4 speed).
  • Up to 3 optional filter upgrade to choose from depending on your needs.
  • Ionizer could be turn on or off.
  • Longer lasting filters (up to 18 months) depending on usage volume/ air quality.
  • Accurate Smart Filter Light replacement indicator that calculates based on usage/ fanspeed/ environment.
  • Abundance of features - SmartSensor (air quality sensor), auto mode, filter life timer, pre-set timer.
  • Child friendly machine with locking control panel and safe vent guard.
  • Alen unique Lifetime Limited Warranty.
  • Lacks odor filtration on bundled HEPA-Pure filter (Optional filter upgrade required).
  • No dedicated odor carbon filter which could come in handy as filter replacement can be done separately.
  • Noisy at highest speed nevertheless Auto mode does come to rescue.
± 599 p
     Annual filter ^    
± 46 - 138 p
Online price*
Latest Amazon price

Alen BreatheSmart FIT50 is slotted right in the middle between the standard BreatheSmart and FLEX. It still has a remarkable purifying coverage at 900 sq. ft. and airflow delivery that outshines other similar segment air purifier. BreatheSmart FIT50 airflow distribution might not be on the same par as  standard BreatheSmart, but what you do get in-return is a smaller and more cost effective air purifier with the same set of features and wide variety of changeable front panel. Other features include SmartSensor with Auto/ Sleep mode, child-lock, filter replacement indicator and many more. As with other BreatheSmart models, we recommend upgrade the filter to HEPA-OdorCell or HEPA-FreshPlus for carbon deodorization missed in the default filter.

With the same plus point as Alen BreathSmart, FIT50 weak points is no difference either so we will not go through it again. One thing worth noting is annual filter replacement cost is the highest between the 3 though not by a big margin. In short Alen BreathSmart FIT50 is "THE balanced one" that suit most people.
  • Multiple color option/ wood trim design front panel cover.
  • Excellent purifying coverage/ airflow delivery although its less effective against standard BreatheSmart.
  • Up to 3 specialist filter upgrades (HEPA-FreshPlus , HEPA-Silver, HEPA-OdorCell).
  • Ionizer is optional that can be disable via the button.
  • Longer lasting filters (up to 18 months) on regular use.
  • Smart Filter replacement indicator that calculates filter lifespan based on usage/ fanspeed/ environment.
  • 4 fanspeed with Auto mode, SmartSensor, pre-set timer.
  • Child friendly machine with safe vent guard and locking control panel.
  • Lifetime Limited Warranty.
  • HEPA-Pure filter lacks odor filtration and optional filter with deodorization requires top up.
  • No dedicated odor carbon filter to support the HEPA filter lifespan.
  • Noise is clearly audible at higher speed although still bearable.
± 499 p
     Annual filter ^    
± 53 - 158 p
Online price*
Latest Amazon price

"THE compact one" for BreatheSmart model, Alen BreatheSmart Flex might comes with the smallest dimension, lightest weight and weakest airflow performance, at 700 sq. ft applicable area. its no slouch either. Powered by the same 3-stage filtration with Pre-filter, Ionizer and 1 of the 4 types of HEPA filters, BreatheSmart Flex has the advantages over the other model in price point and size. Standard equipment includes a 4 fanspeed, our favorite swappable front panel (optional purchase), Smart light filter replacement indicator, Ionizer with on/ off button, timer and lifetime warranty cover by the manufacturer.

As the smallest in its series, weaker airflow delivery rate and coverage is expected, what's left out in the equipment list is Alen's  SmartSensor which is a requirement to support Auto mode. In short any of the 3 BreatheSmart air purifiers would do a bang up job but we would go with either FIT50 or standard BreatheSmart simply for the Auto mode.
  • Changable front panel with tons of modern wood trim design.
  • Consistent and strong airflow delivery rate that supports the wide purifying area.
  • Up to 3 optional filter upgrade that is excellent against allergens and odors.
  • Longer lasting filters compare with similar segment models although that would also depend on usage frequency.
  • Built-in timer (2, 4, 12 hours).
  • Child friendly machine with locking control panel and safe vent guard.
  • Lifetime Limited Warranty.
  • Lacks odor filtration on bundled HEPA-Pure filter (Need to move up with one of the optional filter).
  • No dedicated odor carbon filter that separates from the HEPA filter that would reduce each filter workload.
  • Noisy at highest fanspeed although not the worst in its class.
  • Lacks advanced filter replacement indicator (only basic version), SmartSensor (thus Auto mode), Ionizer. All these is available in BreathSmart/ FIT50.
± 399 p
     Annual filter ^    
± 39 - 118 p
Online price*
Latest Amazon price

Outshine by its own BreatheSmart series air purifier, Alen Paralda might have a conventional tower framework, the wide purifying coverage and strong airflow return would suggest otherwise. It might have standard 3-stage filtration similar with how other Alen's air purifier is setup, the latest Alen Paralda actually comes an upgraded HEPA Silver filter that is great in removing bacteria and germs. Another highlight of Alen Paralda is it manage to cramp in filter light indicator,  programmable timer, digital display and still gets high airflow output. Combining the assurance of Alen Lifetime Limited Warranty,  Alen Paralda is the tower air purifier you should look out for.

As most tower air purifiers, the downside in space-saving size would usually eat up same performance efficiency when compare with conventional size air purifiers. Alen Paralda also lacks Smart Filter Light and have higher annual filter cost then the next item in the list which you should seriously consider as well.
  • Extensive purifying applicable area as with T500.
  • Comes with upgrade HEPA-silver filter.
  • Cable Management System that can hide excessive cords underneath the air purifier.
  • Top pulling filter change that can be done within minutes.
  • The option to turn off Ionizer when not needed.
  • On/ Off Night light keep your setting when the air purifier restarted.
  • Programmable timer.
  • At highest speed 4 setting, only standard fan white noise could be heard.
  • Amazing lifetime limited warranty.
  • Slightly weaker airflow delivery rate.
  • No dedicated deodorization filter.
  • Optional purchase is needed for odor filtration or dealing with strong chemical.
  • Lacks quality sensors for monitoring and enabled Auto mode.
± 324 p
     Annual filter ^    
± 59 - 118 p
Online price*
Latest Amazon price

Lets be clear,  Alen T500 is no looker nor it's a benchmark air purifiers; it shouldn't be. What Alen T500 should be is a reasonably price, compact, lightweight tower air purifier with wide purifying coverage and dynamic airflow. Utilizing the same 3-stage filtration method that includes pre-filter, HEPA filter (up to 4 selectable option) and Ionizer, annual filter replacement cost is on the cheap side thanks to the achievable 12 months filter lifespan. Alen T500 is also well equipped filter replacement indicator, digital display with 24 hour timer and Lifetime warranty. Another plus point worth mentioning is that the CADR and airflow delivery rate is actually better than Alen Paralda.

Again tower air purifier might not have the best performance VS price point ratio compare with conventional air purifier, Alen T500 HEPA-Pure filter also does not comes with any deodorization and there is no standalone carbon filter to addon to its filtration. Between Alen Paralda and T500, We would highly recommend Alen T500 if you are looking for a space-saving yet capable tower air purifier.
  • Comprehensive purifying coverage for a tower air purifier.
  • Easy to bring around thanks to the compact size and back handle.
  • Upgradable HEPA filters depending on your individual needs.
  • Covered by Alen lifetime warranty.
  • Ionizer function can be turned off.
  • Up to maximum of 12 hour timer.
  • Relatively subtle noise with loud but bearable noise at highest setting.
  • No stand-alone deodorization filter.
  • An optional filters purchase (HEPA-OdorCell) is required to deal with strong odor.
  • Lacks air quality sensors and Auto mode especially at this price point.
± 249 p
     Annual filter ^    
± 44 - 88 p
Online price*
Latest Amazon price

What Alen Replacement Filter Do I Need?

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Frequently Asked Questions FAQ

There is a plastic/ rubber odor coming from my brand new air purifier.

The odor is likely coming from the plastic or new materials when you unboxed the air purifier for the first time. Leave the air purifier on with the highest setting and the smell will dissipate in a day or two.

Does Alen comes in power supply 220V as the current voltage is too low for my country.

At the moment Alen only comes with 120V only. We do not recommend using a transformer or step-up converter to alter the voltage output as it would damage the air purifier. Also please keep in mind that Alen warranty would be voided if is used other than country of purchase.

Can you turn off the ionizer feature in Alen?

Yes Alen's Ionizer can be easily turn on or off via a click of a button.

What is the smallest micron particles Alen can capture?

Alen HEPA-filter can capture micron particles including bacteria and viruses as small as 0.3 microns.

Is it safe to leave Alen air purifier on all the time?

Yes it’s safe and recommended to do so as Alen air purifier will ensure the room is protected from airborne particles invasion 24x7. For better energy management, air purifier like BreatheSmart or Fit50 that is equipped with SmartSensor will automatically adjust the fan speed to accommodate the nearby air quality.

Where is the best location for Alen air purifier?

We recommend placing Alen air purifier in bedroom or living hall as it will be the place you spend the most time with. If you have specific concern such as cooking odor, painting chemical or pet dander, placing Alen air purifier close to the main source works great as well. As a reminder, do not place the air purifier close to TV, microwave, radio as the electromagnetic interference might cause damage to the machine. Also leave some gap between the wall to avoid airflow disruption.

How many fanspeed does Alen air purifier has?

Alen BreatheSmart series air purifier all comes with a standard 4 fan speed while lower range model like T500 comes with a standard 3 speed.

There is a soft buzzing sound when Alen air purifier is running.

If you heard a soft buzzing or humming sound on Alen air purifier, the sound is likely coming from the ionizer electrostatically charging and releasing ions. Try disabling the ionizer feature to see if the sound disappear.

How do I replace the filter in Alen air purifier?

First and foremost, unplug your Alen air purifier before performing any filter replacement to avoid electric shock. Most Alen air purifiers has a removable front cover that is connected through magnet. Firmly pull open the cover near the intake vents with one or both hands and pull out each filter via the pull string. Depending on which filter you purchased (HEPA-Pure, HEPA-Silver, HEPA-Fresh/ HEPA-FreshPlus, HEPA-OdorCell), only 1 HEPA filter can be fitted inside and the filter must be install first before the pre-filter. Snap back the front cover by the top tab first follow by the lower tab.

How often do I need to replace the filter in Alen air purifiers?

Pretty straightforward with Alen air purifiers as there is only 1 HEPA filter to maintain. HEPA-Pure has a lifespan between 6 – 12 months depending on air quality and operating hours while HEPA-Silver, HEPA-Fresh/ HEPA-FreshPlus, HEPA-OdorCell has a lifespan of 6 – 18 months also depending on external variables. Premium models like Alen BreatheSmart and Fit50 is equipped with Smart Filter replacement indicator that will calculates filter lifespan based on real-time usage and surrounding environment rather than using a mechanical timer.

How noisy is Alen air purifier?

Alen air purifiers makes fairly low noise other than the third or fourth speed depending on the model maximum airflow output.

Does Alen air purifier cool the air or rather make the air feel warmer?

Neither as Alen air purifier does not have air conditioner or heater attribute. It simply purifies the air.

Can Alen air purifier lower a room humidity?

No it can’t as Alen air purifier does not have humidifier or dehumidifier attribute.

Does Alen air purifier produce ozone?

Very very little as all Alen air purifiers are ozone-safe, certified by the California Air Resources board (CARB) to produce ozone concentrations less than 0.050 parts per million. The ionizer simply emits positive and negative charges into the air that can be disable if you have any concern.

Where is Alen air purifier made from?

Alen air purifier is made in China and developed in the United States.

What does Alen Lifetime Limited Warranty cover?

The Lifetime Limited Warranty cover your Alen air purifier from defects in materials or workmanship as long as you own it.
******** SIDE NOTE ********
  • Warranty will only be applicable if you are the unit original purchaser and in the US or Mexico.
  • Alen air purifier must be connected to a proper power supply (see voltage label). Using voltage converter, transformer or plug adapter will effectively void the warranty.
  • Shows no evidence of tampering, accidental damage, mishandling, modification or repair by anyone other than authorized Alen service personnel.
  • Replace the filter as stipulated timeframe in the manual to avoid excessive stress on the motor.
  • Remember to keep your proof of purchase and register your Alen air purifier at or call 1-800-630-2396 for warranty validation.

What is the differences between each Alen HEPA filters and which Alen replacement filter should I get?

All Alen filters are great at addressing dust, allergies and asthma. For a specific concern, choose:

  • HEPA-Pure - standard filter for household allergy relief.
  • HEPA-Silver - advanced all-around solution filter that is best against mold, germs & bacteria.
  • HEPA-Fresh/ HEPA-FreshPlus - chemical filter that is best against strong chemicals, smoke and VOCs.
  • HEPA-OdorCell - odor neutralizer that is best in removing diaper smell and pet odor.

What is the difference between Smart Filter Light and standard Filter Light?

Smart Filter Light calculates the filter lifespan based on actual usage and surrounding environment while standard Filter Light is purely based on runtime. Smart Filter Light is available in Alen BreatheSmart Classic and Fit50.

What is the differences between HEPA-Silver and HEPA-FreshPlus as both comes with activated carbon?

HEPA-Silver comes with 1.5 lbs activated carbon and is ideal against mold, germs & bacteria while HEPA-FreshPlus comes with higher 3 lbs activated carbon that is best against strong chemicals, smoke or VOCs.

How many filters Alen used?

Alen uses just one filter that is easy to replace if you discounted the washable pre-filter. You do have the option to choose from 1 of 4 customized filters that contains both HEPA and carbon filter materials.

Which is the best filter for paint, chemicals or formaldehyde fumes??

For chemicals such as VOCs or formaldehyde, choose either HEPA-Fresh that comes with 1.5 lbs activated carbon or the stronger HEPA-Fresh/ HEPA-FreshPlus that comes with 3 lbs activated carbon.

Which is the best filter to get rid of the smoke from wildfire/ wood burning?

For Alen, choose HEPA-Fresh or HEPA-FreshPlus (depends on model) would be the best option as it comprises 3 pounds of carbon pellets that is effective in absorbing chemicals component released from wood smoke.

Does Alen get rid of cigarette smoke?

Yes it does but you would have to upgrade the filter to either HEPA-Fresh or HEPA-FreshPlus (depends on model) that comes with thick layer of Activated Carbon.
******** SIDE NOTE ********
  • Alen will not remove residual smoke/ odors from wall paint, furniture, carpet and drapes.
  • Make sure Alen is used in the recommended room size or intended source.
  • Run on higher fan speed for maximum efficiency.
  • Avoid smoker from smoking indoor.

Which filter would work best to get rid of musty mold in a basement?

For Alen, opt for the HEPA Silver filter upgrade as it is designed to tackle mold, germ and bacteria in a basement. A dehumidifier would also be a great help in curbing down microorganism growth.

Which filter do I need to get rid of pet odors and litter box odors?

Yes it can but you have to opt for the HEPA-OdorCell filter upgrade that specialize in eliminating diaper and pet odors.

Which filter in Alen is best for just eliminating cooking smells in an open kitchen?

You could either opt for HEPA Silver Filter, HEPA FreshPlus or even HEPA-OdorCell filter to eliminate light cooking odors.

Is it possible to use more than 1 customizable filter at the same time?

You can only use one filter at a time in Alen. Please select the right filter that is best suited to your environment.

How do I reset Alen filter indicator after I have replaced it with a new filter?

You can reset the filter replacement indicator by holding the button down for about 5 seconds.

Where do I find Alen replacement filter?

You can find the replacement filter for Alen from their official website or at Amazon. Refer to the instructional booklet on the correct filter replacement code or through our product specification.

What is the function of SmartSensor with Auto-Mode?

SmartSensor is of course a sensor that detects the level of airborne particles in its surrounding and pass the information to the air purifier. Auto mode is a feature that automatically adjust the fan speed according to the information it received. Only air purifiers equipped with SmartSensor or equivalent sensor with have the Auto mode feature.

Is Alen air purifier wall mountable?

No Alen air purifier is not wall mountable.

Which filter does Alen comes with?

Alen comes with HEPA-Pure filter by default although user have the option to opt for different set of filter.

Is Alen's HEPA filter washable?

No Alen's HEPA filter is not washable as the water flow would damage the filter’s fiber. You should replace the filter instead according to the recommended lifespan or when the filter replacement indicator light lit up.

Can you use an extension cord on Alen air purifier?

Yes you can extension cord but make sure the cord is not damage in anyway or overloaded from too many connection that would short circuit and damage Alen air purifier.

What is WhisperMax technology?

WhisperMax technology is a noise suppressor that help keeps the noise level down through precise tuning and aerodynamics. Only available in selected models.

Can Alen front panel be painted?

Alen (BreatheSmart series) front primer panel can be fully painted so you can have your own uniquely designed air purifier.

What is the differences between Alen BreatheSmart Classic, BreatheSmart Fit50 and BreatheSmart Flex?

  • Alen BreatheSmart is the highest range in its stable that has the best purifying coverage, CADR/ airflow follow by Alen BreatheSmart Fit50 and BreatheSmart Flex.
  • Alen BreatheSmart Fit50 surprisingly has the lowest noise level although it's hard to tell in real life situation.
  • Both Alen BreatheSmart and BreatheSmart Fit50 comes with WhisperMax technology and SmartSensor + Auto mode while BreatheSmart Flex have to do without.
  • Alen BreatheSmart Fit50 and BreatheSmart Flex also comes with Advanced Smart Filter Life that calculates filter lifespan based on usage/ environment while BreatheSmart Flex have to do with basic Filter Life that based on runtime.
For more details please refer to the comparison table below.
<< Swipe > on products to view more
Alen BreatheSmartAlen BreatheSmart Fit50Alen BreatheSmart Flex
Coverage1100 sq. ft. (102 m2)900 sq. ft. (84 m2)700 sq. ft. (65 m2)
CADR300 cfm (510 m3/h)220 cfm (374 m3/h)245 cfm (416 m3/h)
Airflow150-286 cfm (255-486 m3/h)110-231 cfm (187-392 m3/h)53-187 cfm (90-318 m3/h)
WhisperMax Technology
SmartSensor + Auto mode
Filter replacement indicatorSmart Filter LightSmart Filter LightFilter Light
Weight21 lb (9.5 kg)16 lb (7.3 kg)15 lb (6.8 kg)

How to tell apart which BreatheSmart do I owned?

Check the top black control panel, if you see only BreatheSmart logo in the panel, it’s the BreatheSmart Classic model. BreatheSmart Fit50 model would have its logo on the far right while BreatheSmart Flex model would have the word “Flex” next to BreatheSmart logo.

Alen indicator LED light is very bright. Is there a way to turn it off?

You can turn off indicator light by clicking on the power button when Alen is in operation.

Ultimate Comparison Table

Air PurifierFiltrationCoverageScoreOnline Price (Amazon)
Alen BreatheSmart Classic3-stage1100 sq. ft. (102 m2)8.8
Alen BreatheSmart FIT503-stage900 sq. ft. (84 m2)8.4
Alen BreatheSmart FLEX2-stage700 sq. ft. (65 m2)8.5
Alen Paralda3-stage500 sq. ft. (46 m2)7.3
Alen T5003-stage500 sq. ft. (46 m2)7.5

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