Alen Breathesmart Flex HEPA Air Purifier Review

Alen BreatheSmart FLEX HEPA air purifier is a sleek appliance that falls right below the Alen Fit50 and Alen Classic without compromising on the important purifying qualities. 

Based on the airflow distribution and the area or covers, we shall be comparing every feature and the pro/con to know what is special about the Alen air purifier that could set it apart from other competitors. 

Let us do a full review to differentiate between the Alen air purifier and other BreatheSmart models. 

Air Purifier Buying Guide: The Key Considerations 

Why Buy An Alen BreatheSmart FLEX?

The Alen BreatheSmart FLEX is an amazing unit that comes at a great price and can be personalized to efficiently purify an average size room. It uses the True HEPA filter to clear dust and allergens. 

These features and the BreatheSmart’s designer panels that have various colors and texture makes it able to fit into your home’s interior decor. 

The Alen BreatheSmart Flex is very flexible just like its name, Alen BreatheSmart FLEX implies. It has a slimmer appearance than the other units in the BreatheSmart collection. The designer panels and filters are replaceable and this means you can place it where you wish and choose what you want to take out of the air. 

The control options on the Smart touch panel is basic and does not stress you with too many choices. 

Who Needs an Alen BreatheSmart FLEX

The BreatheSmart family houses the best air purifier you can get. Even on a low budget, you can get the Alen BreatheSmart Flex. Although this unit does not come with the latest features of the BreatheSmart FIT50 it still offers fantastic features from a very reliable and reputable company. 

When to Use an Alen BreatheSmart FLEX

Reports from experts have shown that the air quality in a room snaps back to its pre-filtered low quality just two hours after putting off the air filter. 

Because of this, it is recommended to operate the air purifier 24/7 to maintain a high level of air purity. Using the air purifier as recommended means that you will need to purchase an Alen BreatheSmart flex replacement filter every 8-9 months. 

Complete Alen Breathesmart Flex Review 

The BreatheSmart Flex air purifier can be personalized to trap various airborne contaminants like dust, pollen, pet dander, and mold spores. It was created to carry spaces up to 700 square feet and it can be used in offices, bedrooms, living rooms, etc. Also, the air purifier uses HEPA filtration to keep the air free from airborne pollutants. 

You can only totally remove airborne pollutants in your space when you use a good air purifier. 

The BreatheSmart Flex has been modified to change your surroundings by removing allergens and other airborne molecules. 

We are going to share findings on the performance and features of the Alen air purifier.

Key features

  • 4 fan speeds
  • 2-stage filtration (3-stage with optional filter upgrade)
  • Washable HEPA-Pure filter/Pre-filter
  • Personalizable display cover 
  • Child-safe vent guard and Child-lock control panel 
  • 4, 8, 12-hour timer
  • Lifetime limited warranty
  • [Optional] filters – HEPA-Silver filter, HEPA-FreshPlus filter, HEPA-OdorCell filter
  • Replaceable front panel and latest wood trim design
  • Enhanced airflow delivery rate suitable for the wide area of purification
  • The filter can be upgraded thrice to prevent odors and allergens (optional) 
  • Durable filters (usage frequency matters) 
  • Built-in timer (2, 4, 12 hours)
  • Child lock panel and safe vent guard
  • Long term warranty (limited) 
  • HEPA-PURE filter does not have odor filtration
  • Filter workload is high because of no separate odor carbon filter 
  • The highest fan level produces a lot of noise
  • No improved filter replacement indicator, Ionizer, and SmartSensor which are present in BreathSmart/FIT50


The starting price of Alen BreatheSmart FLEX is under $00. This makes it sort of a middle-range product. The Alen BreatheSmart FLEX is meant to provide the same quality as the best air purifier and compete with the likes of Blue Pure 121, Levoit LV-H133, and Rabbit Air BioGS 2.0.


The Alen BreatheSmart FLEX air purifier basically has plenty of metal on its body and is different from previous models: Alen T500 and Alen Paralda. 

The BreatheSmart company made it different from the other models by making the Alen BreatheSmart FLEX as a complete size air purifier rather than the common tower one. Because of this, the air purifier has a larger fan inside it and has a higher cleaning rate. 

Although the Alen BreatheSmart FLEX is a complete size purifier, it is still at a height of 25 inches and towers over the current Alen Paralda. 

This implies that being a much bigger air filter will improve its chances of trapping more allergens in the house. 

Also, the airflow system was modified to become a simple bottom to top. The Alen Alen BreatheSmart FLEX gets polluted air from the large air intake grille at the back of the panel, purifies it, and introduces it into the environment through the air vent at the top.

Other features on the top of this air purifier include a control panel with 5 main function buttons and an Alen BreatheSmart FLEX logo which is the only factor that differentiates the right air purifier from a false one. 

The Alen BreatheSmart FLEX weighs 15lbs and is bigger. It also has a handle on the top to ensure easy movement to wherever you want in your home. 


There are four different HEPA air filters in the unit to give you quality cleaning. They all remove allergens and dust, however, every single one of them has a specific airborne pollutant that it fights, ranging from smoke,  mold, pet dander and others so you can enjoy life not minding the situation. 

HEPA filtration is very popular for its efficiency in trapping airborne pollutants. The HEPA-Pure filter is installed in the  BreatheSmart Flex to trap and remove the airborne contaminants in your living surroundings. 

The manufacturer states that it is able to remove 99% of the airborne contaminants. Particles like dust, pet dander, mold spores, and other airborne allergens are among the dangerous contaminants that the air purifier removes efficiently. 


The company Alen mentioned that the Alen BreatheSmart FLEX can work properly in a very large room. It is able to purify an impressive 700 square feet. The appliance covers even more space than the Rabbit Air BioGS 2.0 and the Blue Pure 121 which takes 625square feet and 620 square feet respectively. 

Alen BreatheSmart FLEX has an ACH of about 5X. This implies that it is able to clean a room about 5 times per hour, though the size will be a determining factor. 

It has a CADR of 245 cfm overall. The company’s tradition is to create low CADR air purifiers to clean bigger rooms. This means that the Alen  BreatheSmart FLEX will clean a room of 700 square feet at longer durations. 

It is made for flexibility and would be the best air purifier to go into a medium-sized room. Because of its slim nature, the Alen BreatheSmart FLEX is used in boardrooms and offices, bedrooms and living rooms and the customizable designer panels allow you to restyle it. 

You can make several changes in its appearance to match your indoor air surrounding. 

In summary, the Alen BreatheSmart Flex is a wonderful addition to the Alen BreatheSmart family. It is a sleek air purifier that is becoming increasingly famous and has Smart controls, is easy to use and the filter replacement can be done without stress. 

All these goodies come at a comfortable price that will not be a bother to you.

Other Air Purifiers From Alen Breathesmart Brand

Alen BreatheSmart Classic 

Is your home larger than the average? Well, the Alen BreatheSmart Classic Large Room Air Purifier has got you covered. It can purify the air in a space of 1100 square feet every 30 minutes without making too much noise. 

This product produces noise twice as low as that of its major competitors even when it is on Turbo speed. 

The Alen BreatheSmart Classic similar to all high-quality air purifiers works with HEPA-Pure filter that is able to reduce about 99% of airborne pollutants to a low level of 0.3 microns. Together with the Laser Smart Sensor present in the device which also achieves the same purpose, it is able to rid the air in your home of pollen, dander, dust, and allergens.


  • Can choose from 3 optional filter upgrades. 
  • Can turn Ionizer on/off
  • Durable filters that last for about 18 months 


  • No odor filtration 
  • Lacks dedicated carbon filter 
  • Makes a lot of noise at the highest speed 

Alen BreatheSmart 75i

The Alen BreatheSmart 75i is just a prototype of what the appearance of an air purifier produced by the Alen BreatheSmart 75i would be. 

The air purifier has neat lines and a polished interface that definitely attracts people. It has a compact and quite smart control panel with a good performance. It is often more effective with fish oil odors and perfumes. 

The Laser smart sensor can notice the tiniest airborne particles and readjust itself to make the necessary changes needed in the ever-changing surrounding. It displays the air quality of the surrounding on an LED color display which lets you see if it’s functioning effectively or not. 


  • Powerful without making noise 
  • Is good for bacteria, allergies, mold, and pollen
  • Smart and fairly streamlined control panel 


  • Could be somewhat louder than competing brands

Alen BreatheSmart FIT50 Air Purifier

Alen BreatheSmart FIT50 stands right in between standard BreatheSmart and FLEX. It’s room coverage of 900 square feet and remarkable airflow delivery is better than other air purifiers in the same segment. 

Although the BreatheSmart FIT50 cannot distribute the air in the same capacity as the standard BreatheSmart, it lets you get a smaller and cheaper air purifier that has the same kind of features with a lot of changeable front panel designs to choose from. 

It also has extra features like a child lock option, SmartSensor, auto/sleep mode, filter replacement indicator and so on. Just like other BreatheSmart models, it is necessary to upgrade the filter of this product to either HEPA-FreshPlus or HEPA-OdorCell to get the carbon deodorization feature not included in the default filter. 

It has the same advantages as the Alen BreathSmart and the same undersides as it. However, the cost of replacing the filter annually is quite higher than 3 of the 

BreatheSmart products by a little margin but most people prefer the cost of the BreathSmart FIT50 because it is more balanced.


  • Great coverage/ airflow delivery 
  • Has 3 levels of filter upgrades
  • Optional ionizer 


  • No odor filtration in HEPA-Pure filter 
  • Lack of dedicated carbon filter 
  • Loud noise at higher speed

Alen BreatheSmart Flex Buying FAQ

Q1: What are the smallest micron particles Alen can capture?

Alen HEPA-filter is able to trap micron particles such as viruses and bacteria with a size of 0.3 microns. 

Q2: Is it safe to leave Alen air purifier on all the time?

Yes, it is safe. Alen air purifier is meant to be left on 24/7 to make sure that the purifier keeps the home free from airborne pollutants. To conserve energy efficiently, units with SmartSensor like the standard BreatheSmart or Fit50 will set the fan speed automatically according to the air quality. 

Q3: Can Alen air purifiers lower a room’s humidity?

No. Alen air purifier is not equipped with a humidifier or dehumidifier. 

Q4: Does Alen air purifier produce ozone?

Only just a tiny amount. Alen air purifiers have received certification by the  California Air Resources Board (CARB) for being ozone-safe. They emit low concentrations of less than 0.050 parts per million. The ionizer only introduces positive and negative charges into the surrounding air and it is even optional. 

Related: Best Holmes Air Purifier Comparison 


A strong air purifier like the BreatheSmart Flex can trap several kinds of airborne pollutants like bacteria, mold, dander, and pollen. It uses efficient filtration mechanisms to achieve permanently clean and fresh air in the home, offices, and many more.

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