Alen BreatheSmart 75i Review In 2021: Medical Grade Filtration

The most powerful BreatheSmart air purifier to date. Alen BreatheSmart 75i is our favorite pick of the bunch with improved airflow delivery rate and new intelligent sensor technology. Aesthetically and functionality still remain true to its origin, will the upgrade specification match the inevitable price bump? Which variant of BreatheSmart air purifier would best suit your needs? Find out in our Alen BreatheSmart 75i review below.
online price**
±749.00 $$$$$$$/ 7

(annual filter cost ±66-99)

** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.

Alen BreatheSmart 75i Specification

ProductAlen BreatheSmart 75i
18.5 x 27 x 11.5 in
(47 x 68.6 x 29.2 cm)
Weight27 lb (12.2 kg)
Coverage (up to)1,300 sq. ft. (121 m2)
Airflow speed95 - 350 cfm (161 - 595 m3/h)
Dust free (CADR)347 cfm (590 m3/h)
Pollen free (CADR)347 cfm (590 m3/h)
Smoke free (CADR)347 cfm (590 m3/h)
Humidifying(H) speed
- Lifespan
- Replacement cost ($)
Washable Pre-filter (with HEPA filter)
12 - 18 months
HEPA filter
- Lifespan
- Replacement cost ($)
Pure Antimicrobial True HEPA Filter B7-Pure
12 - 18 months
+- 99
Carbon filter
- Lifespan
- Replacement cost ($)
Ionizer/ TechnologiesIonizer
UV-light/ PCO
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
Optional/ Addon
Fresh Antimicrobial True HEPA Filter B7-Fresh
12 - 18 months+- 129
Noise level25-49 dB
Power usage level1.8-45 W
Timer/ Scheduler2, 4, 12 hours
SensorsIntelligent sensor
Auto mode
Air qualityAQ indicator
Filter change indicator
More color options
Wi-Fi/ BTBluetooth
Remote control
Child lock
WarrantyLifetime Limited Warranty
Email/ Phone support

Key Features

  • 3-stage filtration with ionizer
  • Washable mesh pre-filter/ HEPA-Pure Antimicrobial filter
  • [Optional] HEPA Fresh Antimicrobial filter, HEPA Pet filter, HEPA Heavy Odor filter
  • 5 fan speeds with auto mode/ lights-off mode
  • Smart Filter Light indicator
  • Intelligent sensor technology
  • Personalizable front panel design
  • Enhance sleeping experience up to 25% with soothing pink noise frequency
  • Children-friendly with Child-lock and child-safe vent guard
  • 4, 8, 12 hours pre-set timer
  • Lifetime warranty

Design And Usability

Alen BreatheSmart 75i dimension
18.5 x 27 x 11.5 in
(47 x 68.6 x 29.2 cm)
Alen BreatheSmart 75i weight
27 lb (12.2 kg)

The king of open-concept spaces air cleaning. Alen BreatheSmart 75i air purifier is a welcome introduction to owners familiar with Alen lineup. To start with the design, the clean, interchangeable front panel is proportionally shaped with no sharp edges. You can effortlessly swap out the front panel if you need to freshen the looks. At an 18.5 x 27 x 11.5 inches in dimension, it is not the smallest but still perfectly usable even for a small home. Weight-wise, the 27 pounds can be hard to move around especially without casters. Fortunately, there is a carrying handle that you can grab onto when needed. The Air inlet is located on both sides while the air outlet is at the usual top spot. Even though we had it for less than a month, the durability and reliability are top-notch similar to all the top brands.

Alen BreatheSmart 75i control configuration is clear and precise that you would expect no less. You can cycle between the 5 fan speeds (including Turbo), reset the filter indicator after replacing the filter, or set the 2, 4, 12 hours timer. You can also activate/ deactivate the ionizer and auto mode that automatically adjusts the fan speed to high or low depending on the room air quality. With the help of Smart sensor, Sleep mode activates automatically when the lights are out. You can check out the room air quality via the color rings surrounding the power button. Blue = Excellent clean air, Green = Good, Orange = Fair, Red = Poor, Purple = Bad dirty air.

That’s not all, other passive features of Alen BreatheSmart 75i including a child lock that prevents children from meddling with the control and a child-safe vent guard that stops the air purifier from running when the panel is not properly closed. It is also UL listed, CARB approved ozone-safe that produces less than 0.001 PPM with ionizer engaged. You’ll also enjoy Alen’s lifetime warranty as long as the product is officially registered and comes with an active filter subscription.

Airflow, Coverage, And CADR

Alen BreatheSmart 75i coverage
Purifying coverage
1,300 sq. ft. (121 m2)
Alen BreatheSmart 75i fanspeed
As a large room air purifier, Alen BreatheSmart 75i excels in airflow delivery rate and purifying coverage. Between the 5 adjustable fan speeds, it outputs 95 cfm (speed 1); 170 cfm (speed 2); 238 cfm (speed 3); 280 cfm (speed 4); 350 cfm (speed 5). At turbo speed, Alen BreatheSmart 75i can reach up to 1,300 square footage of room space every 30 minutes or 2 air changes per hour. No problem utilizing it in the kitchen, basement, garage, nursery home, classroom, master bedroom, living hall, office, lofts, apartments, or during wildfire with deteriorating air quality.
Alen BreatheSmart 75i dust CADR
347 cfm (590 m3/h)
Alen BreatheSmart 75i pollen CADR
Pollen CADR
347 cfm (590 m3/h)
Alen BreatheSmart 75i smoke CADR
Smoke CADR
347 cfm (590 m3/h)
Tally with the strong airflow, Alen BreatheSmart 75i clean air delivery rate (CADR) is at 347 cfm for dust, pollen, and smoke. It is significantly more powerful than most of its nearest rivals yet without the trade-off in size and weight. Alen BreatheSmart 75i is also independently lab tested to ensure its effectiveness against airborne particles and viruses is met.

Recommended Read

Filters And Performance

Advanced medical-grade HEPA filtration according to your needs. By default, Alen BreatheSmart 75i air purifier comes with an antimicrobial H13 True HEPA Pure filter that removes 99.99% of airborne particles down to 0.1 microns. It will effectively capture dust, hair, mold, mildew, pollen, pet dander, germs, and bacteria that passed through. For extra 20 dollars, you can upgrade to a HEPA fresh filter that removes allergens with the addition of smoke and odors from cooking, cigarette, VOCs, chemicals aerosol sprays. For extra 30 dollars, you can get a HEPA Pet filter that specialized in capturing pet odor and pet dander or HEPA heavy odor that focuses on heavy odors including baby diapers. There is also an ionizer that releases negative ions to attract positive ion pollutants in the air. The combined particles will fall due to the increased weight allowing the HEPA filter to capture.

Noise And Energy Usage

Alen BreatheSmart 75i noise level
Noise level
25-49 dB
Alen BreatheSmart 75i power consumption
Power consumption
1.8-45 W
A quiet and powerful large room air purifier, Alen BreatheSmart 75i noise level is well-suppressed at 25 dB lowest speed to 49 dB at highest speed. Even running at max speed, you can expect a comfortable rainfall equivalent pink noise frequency that may help you sleep better. As an Energy Star certified model, power consumption is at a justifiable 45 wattages per hour. With daily 12 hours of operation, expect an estimated running cost of $0.08 a day, $2.43 a month, or $29.16 annually. Double the cost if you intend to run it 24 hours a day.

Pricing And Maintainence Cost

Alen BreatheSmart 75i MRSP/ RSP
+- 749.00
Alen BreatheSmart 75i annual filter replacement cost
Annual Filter Cost
+- 66 - 99
^ Replacement filters/ estimated cost
All the impressive features and performance comes at a cost. In Alen BreatheSmart 75i case, +- 749 excluding any discounts or promotional deal. While it is 50-100 dollars more than the classic BreatheSmart, the improved airflow performance itself is worth the extra cost. For those that are looking for more cost-effective options, you could opt for the lower variant e.g. breatheSmart 45i, Flex, or Fit 50 that offers the same features but with a lower output.
Being the best seller model, Alen BreatheSmart 75i is available at Amazon at a slightly discounted price. There are also perks to enjoy like bundled deals, free shipping, and 30 days no questions asked return policy guaranteed. Official Alen's webstore is doable as well but you will have to go through the hassle of creating an account and the discount is seasonal. So far we have not spotted Alen products in our local retailers but do check back from time to time.

Alen BreatheSmart 75i VS The Challengers

Airmega 400

Coway Airmega 400

Cheaper by 300 with identical airflow output and applicable area. However, it lacks an ionizer feature and comes with a different filtration setup.
Rabbit Air MinusA2 SPA-780A

Rabbit Air MinusA2 SPA-780A

Mountable air purifier with a cheaper price tag and a more comprehensive 6-stage HEPA filtration. You do have to settle with an inferior airflow output and CADR.


  • Customizable front panel design with many options to choose from.
  • The widest and strongest airflow performance in the Alen BreatheSmart series.
  • All upgradable H13 HEPA filters comes with antimicrobial treatment.
  • Ozone-free Ionizer that can be disabled.
  • Longer-lasting filter that can last up to 18 months.
  • Child lock, Auto/ lights-off mode powered by the newer intelligent sensor.
  • Guaranteed for life when used properly (registered, active filter subscription, no counterfeit filters).


  • Expensive (above 700 price point).
  • No smoke, chemical, or odor filtration on the basic HEPA Pure filter.
  • Uses an all-in-one filter set that cannot be replaced individually.
  • Wi-Fi support would be a nice touch for its price range.
Alen BreatheSmart 75i

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.
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