Today, we’re taking a look at the Alen BreatheSmart 45i. As you may have gathered from the title, this particular air purifier uses a HEPA-filter, and this filter works great for allergies, mold, dust, and bacteria.

In this article, you’re going to learn about the specific features, qualities, and attributes that the Alen BreatheSmart 45i can give you as well as the flaws that this air purifier has and the kinds of things that bother people about the air purifier. Finally, you’ll learn who it’s for and whether or not that person is you.

Alen BreatheSmart 45i HEPA Air Purifier Review

Now, let’s begin by looking at the different features this Air Purifier offers.

One of the first things that you will notice is the design of this air purifier. It’s sleek, to put it mildly. And since it comes in 14 different colors, you’ll be able to choose the color that you most prefer. Each color goes very well with the sleek and minimalist design of the air purifier.

Due to its sleek and minimal design – combined with the relatively lightweight nature of the purifier; it weighs just less than 24-pounds – you can put the Alen BreatheSmart 45i just about anywhere, and it won’t take up too much space.

Now, Alen has taken the time to integrate WhisperMax technology into this air purifier, as well. This serves a very notable purpose because if you have a small apartment or are using this air purifier in a bedroom, too much noise can be rather annoying. With WhisperMax technology, significantly less noise is being produced, in comparison to other Air Purifiers, and this makes the experience less intrusive.

Alen BreatheSmart 45i HEPA Air Purifier


You can use this air purifier in rooms and spaces that are, at most, 800 square feet. Now, you could use this air purifier for spaces that are larger, but it definitely isn’t recommended. Using it in a bigger space will result in less actual air purification being done.

Using a laser-smart sensor, the Alen BreatheSmart 45i can detect particles in your air that are as small as 0.3 microns. And then, these sensors feed this data into the main unit, which begins to adjust itself to accommodate the purification that must be done.

There is a small LED screen that is on this air purifier. To see your air quality, along with some other information, you can just glance at it.

Alen BreatheSmart 45i


Now, the most notable feature of all is easily the HEPA-Silver filter that this air purifier offers. This filter has been designed to take care of allergens, mold, bacteria, dust, and even fungi, as well as various odors.

The filter does this through the use of a compound that has been designed with antimicrobial properties. What this compound does is it takes in the fungi and bacteria that the purifier is sucking in, and it inhibits their growth.

With the odors, the filter has an odor eliminating carbon built into it, and this carbon absorbs the particles that comprise those odors. Based off of the information that Alen has provided, the odors from cooking, as well as chemicals, especially from cleaning, are absorbed the best. Other odors are absorbed as well. But paint fumes have, according to many people, been a bit of a challenge.

Alen BreatheSmart 45i Review

Now, before we get into the flaws of this air purifier, there is one last thing that must be mentioned. Each one of the purifiers that Alen manufactures comes with the Alen Forever Guarantee. This is a lifetime warranty, which means that if you ever have any problems with the purifier, you can send it to them, and they will either fix the problem or give you a new one.

As for the flaws, there is only one flaw. And that’s the fact that the air purifier doesn’t work with spaces larger than 800 square feet. However, this is not a direct flaw, more of a design choice, and as such, it won’t affect you. Unless, of course, you intend to use it in a room/space larger than 800 square feet. Have a look at the larger Alen BreatheSmart 75i Air Purifier.

Related Alen Air Purifier Articles

Single Reviews
Alen BreatheSmart 45i
Alen BreatheSmart 75i
Alen BreatheSmart Classic
Alen BreatheSmart FIT50
Alen BreatheSmart FLEX

Comparison Articles
Alen BreatheSmart 45i vs. 75i
Alen BreatheSmart vs. Rabbit Air MinusA2
Alen BreatheSmart FLEX vs. FIT50 vs. 75i


At the end of the day, when looking at all of the other air purifiers, the Alen BreatheSmart 45i is easily one of the greatest on the market. It’s one of the best air purifiers that you can find, in general, and if you are looking for an air purifier that works wonders, this is it!

Alen 45i Air Purifier

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