Last updated on January 1st, 2022

Alen is an American-based company (similar to Airdog) that focuses on air purification technologies. All of their air purifiers (even the cheapest T500!) use True HEPA filters H13 that are capable of filtering out the smallest particles down to 0.1 microns. Many other air purifiers use True HEPA H11 filters that can capture only 0.3 microns particles, leaving untouched viruses and bacteria.

All Alen air purifiers are eligible for 60-day money back if bought at the official store. Additionally, the company provides lifetime warranty (if you subscribe for filters on their website) which is something unheard of in the air purification market as most manufacturers provide either 2 years or 5 years warranty on their products.

Down below we focused more on different Alen air purifier models (BreatheSmart series, Classis, T500 etc.) and provide links to more detailed reviews.

Alen BreatheSmart 75i

Alen BreatheSmart 75i Review
Filter Type:
Filter Life:
CADR rating:
Room Coverage:
Power:
Noise Level:
True HEPA H13
1 year
347
1300 sq.ft.
1.8 – 45 Watt
25 – 49 dB

Click Here for More Specs & Review

Check price at official store

Alen BreatheSmart 75i is the most powerful Alen air purifier up to date. It can filter out dangerous particles in 1300 square feet space every 30 minutes at the maximum speed!

This air purifier utilizes 3 stage air filtration: pre-filter for pet and dander, True HEPA H13 filter for small particles (gases, allergens, dust, smoke) and ionizer that backs freshens the air. It can be turned off.

There are 3 True HEPA filters available for BreatheSmart 75i: Pure, Fresh and Pet. The first one captures allergens, dust, mold and germs. The Fresh adds to this list cooking odor, smoke and VOCs (volatile organic compounds). The Pet filter has higher efficiency capturing pet dander and odor compared to the previous two.

True HEPA filters should last at least 12 months if run 24/7. The price for replacement filter ranges from $99 to $139, but it is possible to subscribe for filters delivery every 6, 9, 12 or 15 month at the official store and save up 10%. The subscription is also required to have a lifetime warranty on the unit itself.

Pre-filter requires change more often, from 3 to 6 month. They sold 2 pieces in a pack for $19.99.

Alen BreatheSmart 75i is very quiet and although it doesn’t have sleep mode, it can run on speed 1 or 2 and the sound won’t disturb you at all.

If you have asthma, the BreatheSmart 75i air purifier will help you out too. But you probably will have to turn off the ionizer (it emits less than 0.001 PPM of ozone, but still) and the room coverage drops from 1300 square feet to 660 to have minimum 4 air changes per hour. More on ACH & calculator here.

The cons of using BreatheSmart 75i are the next:

  1. The unit doesn’t come with a remote or an app. Yep, you’ll have to walk straight to the air purifier to make any changes.
  2. Auto mode bugs sometimes and incorrectly selects the speed. I.e. air quality is purple (meaning very bad) but the air purifier runs on the lowest speed instead of the Turbo mode.

Alen BreatheSmart 75i is available in several colors: white, stainless, espresso, weathered gray, oak and graphite. The Alen company made sure that the BreatheSmart 75i will fit in any design.

Overall, Alen BreatheSmart 75i is a great air purifier for large rooms. It is not expensive when compared to similar air purifiers, features long-lasting True HEPA H13 filters and several speed modes for smooth air filtration. Even in the turbo mode the unit isn’t noisy at all and power consumption is almost non-existent. As a result, maintenance bills are super low.

Alen BreatheSmart 45i

Alen BreatheSmart 45i air purifier Review
Filter Type:
Filter Life:
CADR rating:
Room Coverage:
Power:
Noise Level:
True HEPA H13
1 year
245
800 sq.ft.
1.1 – 50 Watt
23 – 49 dB

Click Here for More Specs & Review

Check price at official store

Alen BreatheSmart 45i is less powerful version of 75i reviewed above.

The 45i True HEPA filter also lasts for 12 month even if used 24/7, but instead of Pet version OdorCell and HeavySmoke are available. OdorCell filter is designed to capture odor and neutralize it and HeavySmoke features 2 pound activated carbon filter that traps smoke and chemicals.

The replacement filters priced between $69 – 119 and, again, it is possible to subscribe and get 10% off. Pack of 4 pre-filters comes at $19.99 only and there is 5% discount.

The Alen BreatheSmart i45 covers rooms up to 800 sq. ft (2 ACH) or 460 sq. ft. (4 ACH).

Noise level is almost identical to the 75i: no disturbance on low speed and quiet pinky noise at the Turbo.

Being priced way lower than the 75i model, the BreatheSmart 45i is an ideal choice for medium-sized rooms. It helps removes allergens and odor, greatly improves air quality and the filters do not require changes so often.

Alen BreatheSmart Classic

Alen BreatheSmart Classic Air Purifier Review
Filter Type:
Filter Life:
CADR rating:
Room Coverage:
Power:
Noise Level:
True HEPA H13
1 year
300
1100 sq.ft.
1.6 – 105 Watt
42 – 56 dB

Click Here for More Specs & Review

Check price at official store

BreatheSmart Classic is a bit old (but gold!) model that was released years ago by Alen by remains one of their most popular air purifier. And there is simple answer to that: price & quality.

BreatheSmart Classic costs less than the 75i version, but it has almost the same CADR rating. It does consume twice as much energy (use our energy consumption calculator to find out electricity bills) and aren’t quiet even on the lowest setting, so it’s impossible to run it at night.

The are 4 available True HEPA H13 filters for Alen BreatheSmart Classic. They are in price range from $79 to $119 and 10% discount on subscription is also available. Pack of 4 pre-filters replacement costs the same $19.99.

So, what’s BreatheSmart Classic is good for? Anything! It does reduce gases and chemicals in the air, reducing allergy symptoms and greatly improving air quality. But the unit is loud on any settings and it better be used in a basement or living room or any other place which isn’t quiet by itself.

Alen T500

Alen T500
Filter Type:
Filter Life:
CADR rating:
Room Coverage:
Power:
Noise Level:
True HEPA H13
9 months
145
500 sq.ft.
0.8 – 53 Watt
42 – 56 dB

Click Here for More Specs & Review

Check price at official store

Alen T500 is the cheapest Alen air purifier present on the market under $200. It is available in black and white color and can clean air in 500 square feet rooms twice an hour.

The unit is quite small, lightweight and isn’t very loud on the highest speed. It also consumes way less power compared to the Classic version.

There are 4 filters available for T500: Pure, Fresh, OdorCell and Silver. The True HEPA Pure filter is enough for bedrooms and living rooms, the Fresh version is good for kitchen smells, OdorCell captures different kinds of odor including pets and diapers whereas Silver is all-in-one solution. The latter is the priciest one as well (check replacement filters price).

The T500 model doesn’t have pre-filter. It results in lower True HEPA filters life as well as general performance: it can reduce allergens and bacteria, but not as effective as previously reviewed models (75i, 45i, Classic).

Overall, the Alen Tower air purifier can be recommended for small spaces without many pollutants.

Alen BreatheSmart FIT50

Alen Breathesmart FIT50 air purifier review
Filter Type:
Filter Life:
CADR rating:
Room Coverage:
Power:
Noise Level:
True HEPA H13
1 year
220
900 sq.ft.
1.2 – 60 Watt
32 – 49 dB

Check price at official store

Alen BreatheSmart FIT50 also features 3-stage air filtration that includes pre-filter, TrueHEPA H13 filter and ionizer. The latter emits 0.0007 PPM ozone which is below dangerous, but can negatively affect people with asthma. Good thing is that it can be turned off.

This air purifier also comes with different True HEPA filters for different conditions:

  • Pure for allergens and dust
  • Silver for all-around solution
  • FreshPlus if you want to reduce cooking smell
  • OdorCell for pet and diaper odors

Every one of them should for for at least 12 months, used 24/7 daily (check price for replacement filters).

True HEPA Filter is protected by pre-filter. This one is way cheaper (4 pieces for $19.99), but requires changes every 3rd month or so.

The downside of the FIT50 is the auto mode: it can incorrectly pick the speed required to clean air. For example, the LED light shining red (meaning the worst possible air quality in the room), but the auto mode selects low speed at which the air purifier isn’t capable of cleaning the air. So you have to manually select the highest speed and wait for a few hours for air to be cleaned and only after that turn on the auto mode.

Overall, Alen FIT50 isn’t the best Alen air purifier here, that’s for sure. It’s not as powerful as BreatheSmart 75i and not cheap too. Could be used in medium rooms, but too pricey for small ones and aren’t effective in large spaces due to low CADR rating.

Alen BreatheSmart FLEX

Alen BreatheSmart FLEX air purifier review
Filter Type:
Filter Life:
CADR rating:
Room Coverage:
Power:
Noise Level:
True HEPA H13
1 year
225
700 sq.ft.
0.8 – 56 Watt
38 – 55 dB

Check price at official store

Alen BreatheSmart FLEX air purifier designed for small to medium bedrooms, living rooms, kitchens and offices. Compared to the reviewed above Alen air purifiers, it doesn’t not have smart air quality sensor & indicator. So you will have to manually adjust the unit’s speed of air cleaning.

Despite this, the air purifier features the same True HEPA H13 filters priced $69 – $119, depending on the type you need the most (odor, allergy, smoke). All of them last for 1 year if the air purifier runs 24 hours per day. Pre-filters cost way less, but require replacement more often.

The unit isn’t noisy, but it can be heard at night. If you are sensitive to quiet white noise, avoid this model.

Consuming only 56 Watts of electricity per hour, it will results in ~$65 in electricity costs.

The Alen BreatheSmart is good for medium rooms, but definitely not the best air purifier reviewed here.