

Price: $349.00 - $36.99
(as of Nov 16, 2025 02:41:59 UTC – Details)
Product description

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. Alen FLex Video Merchant Video

1 Features
2 Coverage Area
3 Filter Options

1 Allergies
2 Kitchen Odor
3 Wildfire Smoke
4 Sleep Better
5 Pet Odor

1 Good Housekeeping
2 Press Reviews
COMPARISON CHART
Add to Cart
Add to Cart
Customer Reviews
4.6 out of 5 stars 3,278
4.4 out of 5 stars 40
4.8 out of 5 stars 735
4.5 out of 5 stars 1,102
Price
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$284.99$284.99
$488.00$488.00
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Coverage Area
700 Square Feet
1,000 Square Feet
900 Square Feet
1,300 Square Feet
Ionizer Feature
✘
✔
✔
✔
Designer Color Panels
✔
✔
✔
✘
Smart Sensor & AQ Indicator
✔
✘
✔
✔
Maximum Power Consumption
45 Watts
40 Watts
45 Watts
45 Watts
Filter Life (Running 24/7)
12-15 Months
12-15 Months
9-12 Months
12-15 Months
Best Purifiers for Your Space
Open Office Spaces, Basements
Play Rooms, Kitchens, Offices
Big Bedrooms, Workshops
Open Office Spaces, Basements
INCLUDES H13 HEPA PURE FILTER: Eliminates 99.9% of particles as small as 0.1 micron so you can breathe easy. Perfect for bedrooms, living rooms and home offices
PURE AIR ANYWHERE: Compact and lightweight, the BreatheSmart FLEX ensures pure air anywhere in your home, making it an ideal addition to your home essentials and a perfect housewarming gift for a new home. Perfect for smaller spaces like your home office, nursery, or guest bedroom, this small room air purifier adapts seamlessly to your lifestyle
EFFICIENT ROOM SIZE CIRCULATION: Quietly and efficiently cleansing the air, the BreatheSmart FLEX covers rooms up to 1400 sq. ft. every hour. Perfectly suited for kids’ bedrooms, guest rooms, home offices, and home gyms, it’s the ultimate small room air purifier
ENGINEERED TO PERFORM: Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration technology to deliver and maximize airflow while minimizing noise. Our H13 medical-grade filters capture particles as small as 0.1 micron, removing even the tiniest pollutants including dust. Alen air purifiers are energy efficient and designed to run 24/7, generating a total energy cost of only $0.12 per day
ALEN LIFETIME ASSURANCE: Enroll in a filter subscription, and your air purifier remains protected indefinitely. Experience worry-free ownership – we’ll fix or replace any issues at no cost. Transform your space into an oasis of clean air with this essential air purifier, perfect for any smart home
11 reviews for Alen Air Purifier BreatheSmart Flex HEPA with Pure Filter | 1400 Sq. Ft | Perfect for Bedrooms & Home Offices – White
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$36.99

Aliza Hausman –
The Sexiest Little Air Purifier That Could
I am so allergic to dust that if the power goes out in my home, I need to go sit outside until it comes back on and all the air purifiers in my home come back online. Over the years, I have collected quite a collection of air purifiers as we’ve moved from smaller to bigger homes and my allergies have turned into full-blown allergic asthma requiring weekly then monthly shots and daily medication consisting of both pills and inhalers. I buy exclusively from two brands, IQAir and Alen having given up on Blueair altogether in favor of Alen.I own (2) IQAir HealthPro air purifiers and (1) IQAir HealthPro Compact, which I use in our two bedrooms and our living room. Our home has an open layout with a lot of room to cover and so we use a Alen BreatheSmart in our kitchen (with the handy HEPA-OdorCell filter), another in our main room of our back house. I also own (2) Alen T500s, which we use in our back house bedroom and for travel, one of which I received from Alen to test and keep. Vistors are often shocked by the amazing air quality in our home. It’s fresher inside than the great outdoors of Los Angeles.I haven’t tried the Fit50, the now middle child of the BreatheSmart line so I’ll be comparing the Flex primarily with the original flagship BreatheSmart model. The first thing I noticed was how SEXY the Flex is and how much more compact it is than the original BreatheSmart while still feeling quite and if at all possible, more sturdy. It comes in a giant box that’s easy enough to open and is reminiscent Amazon’s frustration-free packaging.The front panel of the Flex is weightier than the BreatheSmart’s and lined with gray plastic and I believe all over magnetics so it need the annoying hinges that the BreatheSmart does. Overall, the materials used look similar but look and feel much improved. The brushed metal surfaces feel quite nice against your skin if you’re planning on cuddling with it. (Kidding.) The darker silver finish and white front are truly aesthetically pleasing. The display is also fantastic with it’s a flat sleek surface with a touch display that is a vast improvement on the clunky push-down buttons of the original BreatheSmart. You can shut off the display lights or keep them on. Also, unlike the BreatheSmart, it offers the same Lock function as the Fit50 which is really useful if you have a little toddler who loves to those push buttons on the original air purifier. Like the other models, the Alen will tell you when your filter is still good (green), when you should order a new one (yellow) and when you’re filter needs replacing (red).At the lowest setting, the Flex is pretty much silent while the third is barely a whisper with the fourth Turbo mode setting is loud but softer than expected but this last setting is really the one you’ll only use when you need to get a room de-dusted quickly, like say in your hotel room, new home office or while staying in the dust mite haven that is your mother-in-law’s really, really dusty back house.The Flex is 15 pounds so it’s almost twice as heavy as the portable travel-friendly Alen T500 tower, which is 9 pounds, but smaller than the 21-pound BreatheSmart and only a pound lighter than the Fit50. The Flex is also stripped down as far as some features that both the BreatheSmart and Fit50 have: the ionizer is gone on the new Flex, as is the SmartSensor, Air quality feedback light and Automatic mode. I’m not sure I personally could not live with the automatic mode which decides on its own what setting is necessary or the SmartSensor that tells me in different colors that the air quality in a specific room is great or really poor. It is also not energy certified and the CADR results are still pending and uses 36 watts on the highest setting whereas the BreatheSmart uses 105 and the Fit50 uses 60.The Alen promises the same filtration rate as all the BreatheSmart models: 99% of particles great than 0.3 microns eviscerated keeping you safe from those dust mites. The filter life is paired down to 6-9 months, a sharp decline from the Fit50’s 10-12 months (awesome!) but only slight change from the BreatheSmart’s 8-9 months. The powers supply comes in at 115V instead of the 120V of the other models. The Flex is recommended for average size rooms up to 700 sq. feet so it falls between the Alen T500 (up to 500 sq. ft) and the Fit50 (at 900 sq. ft) with the BreatheSmart offering the most coverage of up to 1100 sq. ft for large and open spaces. Like all the Alen air purifiers, it comes with the standard HEPA-Pure filter which is the base filter available with the same three options getting slightly more expensive: the HEPA-Silver, HEPA-FreshPlus and HEPA-OdorCell. The HEPA-OdorCell is truly brilliant in the kitchen, where smoke or garbage might cause some terrible smells, and a baby’s room where a diaper pail might do the same.Unlike the vastly more expensive 10-year warranty on the IQAir, which Alen rightly deems “overkill” for most people and their homes, the Alen has a lifetime warranty and they truly stand by it. I had problems with the T300, which the T500 replaced, and received a whole new air purifier each time as a replacement. After being offered the Alen T500 to test by Alen when it first came out, I sold my T500s and bought a second T500 and a third for a friend.If I didn’t already have the top of the line BreatheSmart with the less awesome display, I would really consider this little Flex in my bedrooms. Alen is the air purifier I recommend to anyone with basic allergies or allergic asthma like myself who cannot afford the louder, bulkier, energy-sucking and more complicated and expensive filter requiring energy-sucking IQAir. The IQAir is $200 more than the BreatheSmart’s $599 price tag and the Flex comes in at $399 about a $100 less than the listed price for the Fit50.And last but not least, the Alen Flex offers 14 designer panels to “complement” your décor just like the BreatheSmart and one more than the Fit50. We plan to take advantage of this feature for the first time with the Flex as we will be using this model in the small office where my husband works. The Flex has also made me more curious about the Flex and left me wondering if Alen has plans to upgrade the display on the original flagship model. I highly recommend the Flex and ALL the aforementioned Alen air purifiers.
Madame Slim –
great air purifiers
Love my Alen Air Purifiers. This work well with the larger model. I own three. They are expensive, but I love that you can change the colors of the front panel if you like (of course you have to order them). It is very easy to operate, they’re relatively quiet and gets the job done with cleaning the air. It reduces odors in the home, especially if you get the correct filters. If they less expensive, I would have one in every room – so don’t pass on a sale!
Fly On The Wall –
Quiet at lower 2 speeds works well
Seems to work well. low speed very quiet. 2nd can hear. Any use of higher speeds fairly loud not for tv listening on those speeds.
John and/or Katie Grey –
Same great performance as the higher-end model—without the fluff, and more efficient
After using the 45i model, I picked this one up for another room and honestly—it might be the better buy. The air-cleaning performance is just as good, maybe even a bit stronger at similar fan speeds. It still uses Alen’s excellent HEPA filtration system and clears out dust, odors, and allergens noticeably fast.What you don’t get are the “smart” extras—no app, no lights you can toggle off—but that’s fine by me. The Flex keeps things simple: it turns on, runs efficiently, and purifies the air quietly without trying to be a smart device. And the big plus? It’s nearly twice as efficient in terms of energy use compared to the 45i, at least in my setup.Noise levels are low, even on medium or high, and the build quality is just as solid. If you don’t care about app connectivity or lighting controls, this model gives you the same (or better) air quality for less money and lower energy draw.Highly recommend it—especially for bedrooms, offices, or anyone trying to simplify without sacrificing performance.
MarjieW –
Easy to use, seems to be working as intended
I just got this yesterday. It’s my first air purifier so I did research and asked a friend who has two. I got the espresso color since it goes best with my home. It was easy to get started. I wasn’t sure what to expect but was pleasantly surprised to come back and see visible evidence of dust being removed. I ran it again this morning after cooking bacon and the odor was cleared quickly. After less than 24 hours use, I’m pleased.
JeanKR –
Great Air Purifier
Great little air purifier. Easy to carry from room to room. Controls are simple and not complicated. Very happy with this purchase.
Sandy –
I love this air filter! Now, we’ve only had it a few days but already I feel a difference.
Fred McCutcheon –
So far so good. Had it two weeks in my office to keep it dust free. A big improvement in the air quality compared to what the office building is “providing”…
SuMo –
I knew of this brand from when I lived in the US, and thought the price was a good deal. I eventually bought two units due to severe dust allergies. The units are bulky and came with two separate power cords, one for the UK and one for EU. The EU cords ones were useless and were thrown away, so environmentally unsound. The units are noisy at the higher speeds, and truth be told work no better than two tower units I previously had. The filter indicator does not work properly as it remained green even though I could tell the filters needed to be changed. Now the best part, I went to order the replacement filters and they are nowhere to be found in the UK. I was beyond frustrated. I wrote to Alen in the US to be told that their auto ship filter service does not ship to the UK and to find some on Amazon US or eBay. I did find some off market ones on Amazon US and they work great, but with the cost, plus shipping, and now the issues with the economy, this will not be feasible. I bought these filters to have the units running whilst I source a reliable brand that has filters widely available in the UK. Again I don’t think the unit is anything special, and the filters are almost impossible to find. I hate that these are going to wind up in the rubbish as well. Horrible experience. When buying something that needs ongoing support (like filters) do your homework. I made the mistake of assuming since they were sold on Amazon UK they would be supported. No such luck. Better items from companies that care about customers are out there.
Chris Jones –
The unit arrived early and, since turning it on, it has really helped with my daughter’s allergy to dogs. It is quiet and was easy to install.
E. RAY CRITCHETT –
tengo 2 y no puedo encontrar algo mas eficiente aunque he tenido diferentes modelos y marcas.