Alen BreatheSmart 75i review

A smart-looking purifier with high-quality filters and air cleaning performance to match.
By
Updated on May 29, 2024
Written by
Danny Ashton
Danny is the founder of HouseFresh and has been writing about air purifiers and indoor air quality since 2010. He is our lead tester, conducting all the tests we use to evaluate air quality products. That is why you will always see his name attached to our reviews.

Our verdict

The BreatheSmart 75i may cost more than rival manufacturers, but you get what you pay for just like buying a Rolls Royce or Cadillac. 

 

The build quality, air cleaning speed and filter options are all excellent, plus Alen’s unrivaled lifetime warranty protects your investment long into the future.

 

I especially love Alen’s H13 HEPA and weighty activated carbon filters, which make this a top pick against heavy pollutants like cigarette or wildfire smoke. The 75i’s powerful fans mean this unit can be used in large, open-plan spaces.

Alen air purifiers are highly regarded for their impressive design, build quality and performance. This Texas-based manufacturer has developed an excellent reputation by being at the forefront of the industry for over 15 years.

Alen are also known for their above-average prices. There’s no denying that the BreatheSmart 75i falls into the high-end category with a price tag of $749.

This leaves many consumers wondering if it’s worth spending the extra money and what they can expect in return if they invest in the BreatheSmart 75i.

From testing Alen’s BreatheSmart 45i and Flex models firsthand, we know that they deliver on quality and, on paper at least, the 75i certainly seems to tick a lot of boxes too. 

Unpacking this unit, you’ll find a medical-grade H13 HEPA filter, a colossal room size suitability of 1,300 sq. ft. and an array of smart features to boot. But to really see if it warrants the premium price tag, we decided to purchase the 75i for ourselves and see how well it performs in our real-world tests.

  1. In our home lab of 728 cubic feet, we light an incense stick to generate particle pollution and VOCs.
  2. We set up our trusted Purpleair Indoor Sensor with the latest Bosch gas sensor to track levels of PM1ug/m3, PM2.5ug/m3 and PM10ug/m3 and VOCs in the air.

  3. We switch the air purifier to its highest speed and measure how long it takes to get our room air quality down to PM1 level to 0.
  4. We use an energy meter to measure precisely how much electricity is used when running the unit at the lowest and highest fan speed settings.

  5. We track sound levels emitted by the air purifier at different fan speeds with the help of a commercial sound meter.

Read more about our testing process, and feel free to get in touch if you have any questions.

The lowdown on the Alen BreatheSmart 75i 


“The Alen BreatheSmart 75i is on the expensive side of air purifiers but it’s worth the high price ticket. Air cleaning performance is excellent and it comes with a large activated charcoal filter, which is crucial for people who are trying to tackle smells and smoke.”

— Danny Ashton, Founder & Senior Writer


Looking for the lowdown on the Alen BreatheSmart 75i? Here are my key findings from our hands-on review. 

The BreatheSmart 75i is Alen’s most powerful air purifier, with an Energy Star-certified CADR of 330 CFM for smoke, 335 CFM for dust and 403 CFM for pollen. However, this performance comes at a cost, with the unit currently retailing for $748.99.

Other options with a similar CADR include the Levoit Everest Air (360 CFM), which costs $499.99, the Blueair Blue Pure 211+ (350 CFM), which will set you back $311.36 and the IQAir Healthpro Plus (300 CFM) that retails for $899.99. With various options available at different price points, it will be interesting to see how the 75i measures up.  

What we really like

With a CADR score of 347, this is a super powerful purifier that will deliver clean air in no time at all.
I was impressed that performance didn’t drop off when used at lower speed settings. At speed 1, you can still expect a CADR of 95 CFM and 170 CFM at speed 2. 
Alen is the only manufacturer to offer a lifetime warranty.
Despite being a powerful purifier, the 75i creates low operating volumes and draws minimal energy.
Filters last a long time, and users can customize the activated carbon content to suit specific needs. 

What we think could be better

This unit is large, so it may get in the way in smaller homes or apartments.
Alen needs to look at their app again, as I found it had a few issues to fix.
At $749, this may be out of many people’s budgets. 

HouseFresh rating:★★★★☆
Time to clean our 728 cubic feet test room (with the device running at top speed):24 minutes
Air purifier technology:True HEPA H13 filters with activated carbon pellets + Ionizer technology
Recommended room size (4.8 air changes per hour):512 sq. ft. 
Clean air delivery rate (CADR):Dust: 335.3 CFM
Smoke: 330.5 CFM
Pollen: 403.4 CFM
Dimensions (in inches / in cm):27H x 18.5W x 11.5D inches (68.58H x 46.99W x 29.21D cm)
Weight (in pounds / in kg):27 lbs (12.2 kg)
Filter life:12 – 15 months
Noise level in decibels (as reported by the manufacturerv):24 – 49dB
Electricity consumption in watts (as reported by the manufacturerv):Lowest fan speed: 1.8 watts
Highest fan speed: 45 watts
Estimated running cost (electricity consumption + official filter replacement):$162.12 per year
Cost per CADR cfm (based on dust CFM as reported by AHAM):$2.23
Manufacturer’s warranty:Lifetime (with product registration & active filter subscription)
Country of manufacture:China

Slick design with simple controls

The BreatheSmart 75i may be a large unit, but it won’t look out of place thanks to its clean aesthetic.

The first thing to mention is that the BreatheSmart 75i is a bit of a beast. 

It uses large fans and filters, so it naturally has a larger footprint than the average unit. Just to show you the sheer size of the 75i, we took a photo of it next to the Wirecutter’s darling: the Coway Mighty AP-1512HH. See how much bigger the Alen 75i is in comparison:

But where other large purifiers, like the IQAir Healthpro Plus, have resigned themselves to the aesthetic of a 90s printer, the 75i looks pretty sleek and sophisticated. 

You can pick from a range of colors to best suit your home, but I think it looks great with its glossy white facade and grey trim.

Lined up against other purifiers we’ve tested, the 75i doesn’t struggle to blend into its surroundings without dominating the room. 

Alen also made sure to make their control panel look classy. 

From the control panel, you can cycle through the four fan speeds, set a timer for 2, 4 or 12 hours, lock the settings and receive a warning when your filter is approaching the end of its lifespan. 

The touchscreen controls are easy to understand and boast a little flair through the color-coded air quality display that relays particle readings to the user

One of my favorite features on the 75i is its Auto mode, which is highly responsive at recognizing changing pollutant levels and automatically adjusting the fan speed to tackle particle build-ups before slowing back down to conserve energy. 

You’ll also find an ionizer, which can be used to charge particles and improve effectiveness or disabled to reduce the risk of any ozone at the user’s discretion, although the 75i has been found to produce less than 0.001 PPM of ozone with the ionizer engaged, so shouldn’t be an issue. 

Alen has also developed an app to remotely control your air purifier and provide updates on filter life and air quality readings to your mobile device. However, Alen still has some bugs to iron out, as my 75i mysteriously disconnected from the app on numerous occasions. 

H13 HEPA filters to tackle the tiniest particles

Alen offers an excellent primary filter as standard, and you can tailor carbon quantities to suit your needs.

How well an air purifier performs often depends on the filters it boasts. Alen has addressed this by opting for an ultra-effective medical-grade H13 HEPA. This filter can capture 99.9% of particles as small as 0.1 microns, meaning allergens, smoke and bacteria particles will be removed with impressive efficiency. 

One thing I love to see when reviewing filters is a third-party test to prove that they match what is advertised. Especially in the wake of Levoit removing all traces of HEPA branding following a complaint to the BBB

The good news is that Alen had their filters independently tested and even shared LMS Technologies’ microbiology report for any concerned consumer to read. 

It’s a shame that Alen doesn’t include any activated carbon in their standard ‘Pure’ filter, but they do offer a range of upgraded filters with varying carbon amounts to tackle VOCs and odor.

If you’re looking to buy an Alen 75i to help you tackle VOCs and smells, you get two options:

  • The Fresh filter, which includes a colossal 3.6 lbs of pelleted carbon.
  • The Odor filter, which combines carbon with an odor neutralizer to tackle persistent pongs from cooking, pets or musty mold.
Tip

Remember, all new filters will come in a plastic wrapper. Be sure to remove this before installing any filter into your unit.

You can see the price difference between these three filters in the table below:

Alen Air Filter B7-Pure Replacement H13 True HEPA FIlter for BreatheSmart 75i Air Purifier - Captures Allergens, Dust, & Mold (1 Filter)
Alen Air Filter B7-Fresh Replacement HEPA Filter for BreatheSmart 75i Air Purifier - Captures Allergens & Mold + Odors & Smoke (1 Filter)
Alen Air Filter B7-Odor Replacement True HEPA Filter for BreatheSmart 75i Air Purifier - Captures Allergens & Mold + Pet Dander & Odors (1 Filter)
Technology
Standard medical-grade H13 True HEPA filter provides outstanding protection for your home’s largest spaces, removing 99.99% of dust, allergens, and harmful fine pollutants as small as 0.1 microns. Enjoy 1,300 SqFt of healthy air every 30 minutes.
Get all the wellness benefits of our standard medical-grade H13 True HEPA filter plus the power of activated carbon for added protection against toxins like volatile organic compounds (VOCs), pollution, and smoke. Capture 99.99% of harmful particles as small as 0.1 microns and keep your home’s air smelling incredibly fresh.
For clean and fresh-smelling air in any pet-friendly home, trust Alen’s patented nontoxic technology to instantly destroys odors at the molecular level. Stop unpleasant smells from accidents, litter boxes, and stinky pets while Alen’s legendary medical-grade H13 True HEPA filtration purifies 1,300 SqFt every 30 minutes.
Price
$99.00
$129.00
$139.00
Filter
Alen Air Filter B7-Pure Replacement H13 True HEPA FIlter for BreatheSmart 75i Air Purifier - Captures Allergens, Dust, & Mold (1 Filter)
Technology
Standard medical-grade H13 True HEPA filter provides outstanding protection for your home’s largest spaces, removing 99.99% of dust, allergens, and harmful fine pollutants as small as 0.1 microns. Enjoy 1,300 SqFt of healthy air every 30 minutes.
More information
Price
$99.00
Filter
Alen Air Filter B7-Fresh Replacement HEPA Filter for BreatheSmart 75i Air Purifier - Captures Allergens & Mold + Odors & Smoke (1 Filter)
Technology
Get all the wellness benefits of our standard medical-grade H13 True HEPA filter plus the power of activated carbon for added protection against toxins like volatile organic compounds (VOCs), pollution, and smoke. Capture 99.99% of harmful particles as small as 0.1 microns and keep your home’s air smelling incredibly fresh.
More information
Price
$129.00
Filter
Alen Air Filter B7-Odor Replacement True HEPA Filter for BreatheSmart 75i Air Purifier - Captures Allergens & Mold + Pet Dander & Odors (1 Filter)
Technology
For clean and fresh-smelling air in any pet-friendly home, trust Alen’s patented nontoxic technology to instantly destroys odors at the molecular level. Stop unpleasant smells from accidents, litter boxes, and stinky pets while Alen’s legendary medical-grade H13 True HEPA filtration purifies 1,300 SqFt every 30 minutes.
More information
Price
$139.00

The Alen BreatheSmart 75i cleared our test room in 24 minutes

We recorded rapid particle removal fueled by the 75i’s powerful fans and filters

Like all air purifiers featured on HouseFresh, the Alen BreatheSmart 75i underwent our clean air speed test.

This is where we fill our 728 cubic foot home lab with incense smoke and time how long it takes for a purifier to remove all traces of PM1.0ug/m3, PM2.5ug/m3 and PM10.0 ug/m3 particles, using our highly accurate PurplAair Touch air sensor. 

The 75i performed as expected, clearing the room in 24 minutes.

The graph shows a sharp rise as our simulated pollution contaminates the room. Once the room was filled with smoke, I turned on the BreatheSmart 75i to its highest setting (around 15.35hs) and left the room, measuring PM1 levels remotely using the software we have built to tap into the PurpleAir API.

Air cleaning performance: Test results compared

As mentioned above, with the purifier set to its highest speed setting, we saw the Alen BreatheSmart 75i clear the space of all pollutants in just 24 minutes.

This time puts the 75i just outside the top 10 air purifiers we’ve tested to date, falling marginally behind similarly powered units such as Blueair’s Blue Pure 211+ (18 mins), yet besting one of the most technical units on the market in the IQAir Healthpro Plus (25 mins). 

Noise levels: Test results compared

In addition to air cleaning speed, noise levels are crucial when purchasing an air purifier. The noisier the device, the less likely you will want to use it regularly.

Using our decibel monitor from a distance of three feet away, we measured that the Alen BreatheSmart 75i created 24 dB at its lowest level and 49 dB at top speed. 

These are incredibly low volumes for such a powerful unit, ranging from the sound of a whisper to the hum of a refrigerator. Compared to other units, we see that the 75i is one of the quietest units we’ve tested to date, so you have nothing to worry about if you’re a light sleeper or easily distracted. 

Of course, sound is a highly subjective topic, so we made sure to record the test, allowing you to hear the 75i for yourself.

The cost to run an Alen BreatheSmart 75i: $167.64 per year

1. Electricity costs = $68.64 per year

With energy prices on the rise, it’s essential to consider the running costs of any new electrical appliance. By connecting the 75i to our wattage monitor, I was able to see how much energy this unit draws when used on its various speed settings. 

I was pleasantly surprised to see that the 75i drew between 1.8 watts and 45 watts, despite its powerful output. I then used the latest average energy prices as reported by the Bureau of Labor Statistics to calculate how much running this purifier at its top speed 24/7/365 would add to your annual bill: $68.64. 

91 cents per week is already very efficient, but it’s worth remembering that you’re unlikely to use the purifier in this way, so you can expect to see even lower charges with ordinary use.

2. Filter costs = $99.00 per year

As the Alen purifier uses HEPA and carbon filters, over time, they will become saturated with pollutants, lose efficiency and eventually need replacing.

The good news is that Alen’s filters last for age, with a lifespan between 12 and 15 months, even when used around the clock. 

The bad news is that Alen’s filters aren’t exactly cheap. The standard Pure filter costs $99; if you’re looking for protection from VOCs, the Fresh filter increases to $129 and the Odor filter $139. Other brands like Blueair and Levoit have filters available for between 50 and 70 bucks, but it’s worth pointing out that they will only last half the time, so costs may even out overall.

OEM Alen 75i B7-Pure Filter Replacement
  • PURE HEPA AIR FILTER: Breathe cleaner air with the Alen Air Purifier’s high-quality HEPA filter. This advanced filter captures allergens, dust, mold, and germs, promoting a healthier and safer environment for you and your loved ones
  • MEDICAL-GRADE H13 TRUE HEPA FILTER: Discover the exceptional power of our medical-grade H13 True HEPA filter within your home. Our filter captures 99.9% of airborne particles as small as 0.1 micron, this technology provides clean and fresh air throughout your space. Take control of your indoor air quality and create a safe haven for your family

Remember that Alen filters offer amazing protection from even the smallest particles, which is a worthy investment. Plus, with an active filter subscription, you’ll get a lifetime warranty on your purifier for added peace of mind. 

Savvy shoppers may have noticed that generic filters are widely available online. We recently tested a replica filter for the BreatheSmart 45i and saw an almost identical particle removal rate. They can considerably reduce filter replacement costs, so it may be worth considering if you’re not too bothered about the lifetime warranty. 

Unofficial 75i Filter Replacement
  • PERFECT COMPATIBILITY: Our 75i True HEPA filter replacement is compatible with 75i Air Cleaner Purifier, for models B7-Fresh, B7-MP-Pet, and B7-Pure.
  • TRUE HEPA FILTRATION: The 75i True HEPA Filter Replacement effectively filters up to 99.97% of airborne particles as small as 0.3 microns, including dust, pet dander, smoke, and more small particles. Breathe in cleaner, fresher air with every use.

Bottom line

Smart features, sophisticated design and speedy air cleaning make the 75i a triple threat.

Yes, it may be large, and yes, it may be expensive, but the BreatheSmart 75i has been one of the best air purifiers to pass through the HouseFresh doors.

Designed for use in spaces as large as 1,300 sq. ft. (performing 2 air changes per hour), the powerful purifier boasts impressive CADR ratings and eradicated all traces of pollutants in just 24 minutes during our clean air speed test. 

Cheaper units, such as the Levoit Everest Air or Blueair Blue Pure 211+, did manage to clear pollutants faster during our clean air speed test, so if speed is a critical factor for you, then you may be better served elsewhere. However, as neither of these brands uses medical-grade HEPA filters nor allows you to tailor the amount of carbon, the 75i is worth considering if you are immunocompromised, suffer from allergies or live in areas affected by wildfires. 

Overall, the 75i ticks many boxes that other options don’t, while its lifetime warranty makes it a reliable investment that will continue to offer protection for years to come.  

SOURCES

We calculated yearly costs associated with running the Alen BreatheSmart 75i for 24 hours a day, 365 days a year, based on the U.S. average utility rate of $0.174/kWh as of March 2024.

Alen BreatheSmart 75i review - HouseFresh

The Alen BreatheSmart 75i is a powerful air purifier, packed with activated charcoal, making it ideal for those dealing with smoke, odors and VOCs.

Product SKU: 0810587028485

Product Brand: Alen

Editor's Rating:
4

Pros

  • With a CADR score of 347, this is a super powerful purifier that will deliver clean air in no time at all.
  • I was impressed that performance didn’t drop off when used at lower speed settings. At speed 1, you can still expect a CADR of 95 CFM and 170 CFM at speed 2.
  • Alen is the only manufacturer to offer a lifetime warranty.
  • Despite being a powerful purifier, the 75i creates low operating volumes and draws minimal energy.
  • Filters last a long time, and users can customize the activated carbon content to suit specific needs.

Cons

  • This unit is large, so it may get in the way in smaller homes or apartments.
  • Alen needs to look at their app again, as I found it had a few issues to fix.
  • At $749, this may be out of many people’s budgets.

Last update on 2024-06-16 / Affiliate links / Images from Amazon Product Advertising API

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About the author

Danny Ashton

Danny is the founder of HouseFresh and has been writing about air purifiers and indoor air quality since 2010. He is our lead tester, conducting all the tests we use to evaluate air quality products. That is why you will always see his name attached to our reviews.

Join our newsletter

We’ll send you a nice email every once in a while. No spam.

Support HouseFresh

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Your support makes it possible for us to keep doing what we do.
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