Alen Air Purifiers review
Updated September 30, 2026 · SmartHomeCue Editorial Team · Facts checked September 30, 2026
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Our verdict
Alen Air Purifiers suits buyers who want a single machine covering a large open floor and will keep it running for years. The top BreatheSmart purifier delivers 637.125 m³/h of clean air delivery for a 260.13 m² room, and the entry tower purifier opens the range at $149.
Key facts
- Best for
- US buyers who want a single purifier sized for a large open room and will keep it running for years.
- Reference models
- BreatheSmart 75i, BreatheSmart 45i, BreatheSmart 35i (Source, checked September 30, 2026)
- Price from
- $149 (Source, checked September 30, 2026)
- Clean air delivery rate (m³/h)
- 637.125 (Source, checked September 30, 2026)
- Room size (m²)
- 260.13 (Source, checked September 30, 2026)
- Filter cost per year
- $79.20 to $99 (Source, checked September 30, 2026)
- Filter change interval
- 12 to 15 months (Source, checked September 30, 2026)
- Quietest noise level (dB)
- 25 (Source, checked September 30, 2026)
- Power use (W)
- 1.36 to 55 (Source, checked September 30, 2026)
- Mobile app
- Yes (Source, checked September 30, 2026)
- Warranty
- 1 year (Source, checked September 30, 2026)
- Markets
- US (Source, checked September 30, 2026)
- Legal entity
- Alen Corporation (Source, checked September 30, 2026)
- Headquarters
- United States (Source, checked September 30, 2026)
- Support channels
- Phone, Help-centre (Source, checked September 30, 2026)
- Products
- Purifier
- Filter types
- Hepa h13, Carbon, Ioniser
- Certifications
- Energy star
- Official website
- alen.com
Apps and profiles
- Get the app
- Google Play
- Elsewhere
Pros and cons
Pros
- 637.125 m³/h of clean air delivery with 260.13 m² of stated coverage, so a single unit handles a big open room.
- Filters last 12 to 15 months and cost $79.20 to $99 a year, which spreads the running cost over fewer purchases.
- Runs at 25 dB on the quietest setting, so a machine in a bedroom does not need switching off at night.
- A mobile app is included and support runs on phone and help centre, so control and help both come from the maker.
Cons
- Entry price of $149 ranks 49 of 76 brands, so this is not the cheapest way into the category.
- The catalogue is limited to purifier, so Vornado Air or Daewoo Electricals suit a buyer who also wants a fan or a dehumidifier.
- Availability is listed for US alone, so a buyer elsewhere has less reason to choose this brand over Clarifion.
- Cover runs 1 year, leaving an owner with a long lived purifier paying for repairs outside that window.
Ready to try Alen Air Purifiers?
Scored 8.9 / 10 by SmartHomeCue.
Who it suits
- US buyers who want a single purifier sized for a large open room rather than a small bedroom.
- Households that want app control alongside phone and help centre support from the maker.
- Owners who plan to keep one unit running long term, since 12 to 15 months between filter changes spreads the cost of $79.20 to $99 a year over fewer purchases.
Who should look elsewhere
- Buyers who want fans and humidifiers as well as purifiers, since Vornado Air covers purifier, humidifier and fan.
- Homes that also need drying, since Daewoo Electricals covers purifier, dehumidifier and fan.
- Pet odour cases, since Clarifion lists a pet smell neutralizer among its models.
Plans and prices
Pricing on Alen splits into what the machine costs and what the filters cost afterwards. The entry tower purifier opens the range at $149, and the top BreatheSmart model is the one the published running costs describe. Filter replacements for that BreatheSmart model add $79.20 to $99 a year, which is the part of the outlay that repeats and the part most buyers overlook at entry. A buyer who plans to run a single purifier for years should weigh the $149 entry tower purifier plus the yearly filter line against cheaper machines, since the entry price says little about the running cost.
Core features
The top BreatheSmart model is the reference machine for the figures Alen publishes, and it is built for large rooms: 637.125 m³/h of clean air delivery against a coverage figure of 260.13 m². Power draw runs 1.36 to 55 W, so the same unit spans a wide spread of settings, and the quietest level sits at 25 dB, low enough to leave running overnight. Filters are good for 12 to 15 months before they need changing, and that interval is the main ongoing job an owner has. A mobile app is included for control, and cover runs 1 year.
How it compares on our data
On our data Alen Air Purifiers sits near the top for air delivery and coverage, and lower down for price. Clean air delivery ranks 18 of 47 brands, room coverage 14 of 54, and yearly filter cost 27 of 46. Entry price is the weakest line, at 49 of 76. The pattern is straightforward: pay more for the machine, get more air moved and a larger area covered. Buyers who weigh air delivery and coverage above entry price will find that trade easy to accept.
The company behind it
The brand is Alen Corporation, headquartered in the US, and the range is sold in the United States. Support runs on phone and help centre, covering a phone line and a help centre. That suits buyers who would rather deal with the manufacturer directly than through a retailer, and it suits anyone who prefers to call rather than work through an app for a filter change or a noise question.
How Alen Air Purifiers compares
- 8.9 vs 9.1
8.9 vs 9.1- 8.9 vs 8.5
8.9 vs 9.0
8.9 vs 8.9
8.9 vs 9.0- 8.9 vs 9.0
8.9 vs 9.4Arno
- 8.9 vs 9.0
8.9 vs 8.7- 8.9 vs 9.2
- 8.9 vs 9.2
8.9 vs 9.1
8.9 vs 9.0
8.9 vs 9.1
8.9 vs 8.7BlazeVideo DE
Where Alen Air Purifiers is available
- Available
- United States
Countries from the brand (Source, checked September 30, 2026)
Frequently asked questions
How much does the cheapest Alen purifier cost?+
The entry tower purifier sets the entry point at $149. Filters for the top BreatheSmart model add $79.20 to $99 a year on top, so the yearly figure matters as much as the sticker price for anyone keeping the unit for years.
What do replacement filters cost and how often do they need changing?+
Filters for the top BreatheSmart model run $79.20 to $99 a year, and filters hold for 12 to 15 months between changes. That interval sits above the 6 months typical across the category, which is why the yearly figure reads as reasonable.
Will a single Alen unit handle a large open room?+
The top BreatheSmart model is rated at 637.125 m³/h of clean air delivery with a coverage figure of 260.13 m². That puts it well above the 153.29 square metres common across the category, so a single machine suits an open plan space rather than a small bedroom.
Is it quiet enough to run in a bedroom?+
On its quietest setting the BreatheSmart runs at 25 dB. Power draw ranges across 1.36 to 55 W depending on fan speed, so the same machine can be turned down at night and pushed up when a room needs clearing.
Can I control it from an app and get help when something goes wrong?+
A mobile app is included with the machines. Support runs on phone and help centre, so you can call or work through the help centre rather than relying on the app alone. The legal entity behind the brand is Alen Corporation.
What warranty comes with an Alen purifier?+
Cover runs 1 year on the machines. The BreatheSmart pairs that with hepa h13, carbon and ioniser as standard, and the length of cover matters if you plan to keep a single unit running for years.
Is the range energy certified?+
Alen lists energy star among its certifications. Power draw on the BreatheSmart runs 1.36 to 55 W, so the certification speaks to the running side of the cost rather than the purchase price, for buyers who keep a machine on continuously.
Where can I buy Alen purifiers?+
The listed market is US and the brand is headquartered in the US, so availability is strongest there. Buyers in other countries should check Clarifion or Vornado Air for local supply before planning around a specific Alen model.
Which Alen models are on the list?+
Alen lists BreatheSmart 75i, BreatheSmart 45i, BreatheSmart 35i as its reference models. The largest of them is the model behind the published air delivery of 637.125 m³/h and coverage of 260.13 m², so that is where comparing should start.
Sources
- alen.com checked September 30, 2026
Backs: Mobile app, Products, Reference models, Support channels
“App Controlled: Yes BreatheSmart 75i”
- alen.com/pages/about-us checked September 30, 2026
Backs: Headquarters
“Austin-based innovator”
- alen.com/pages/alen-forever-guarantee checked September 30, 2026
Backs: Markets, Warranty
“Alen ships products to residents of the Continental US, Hawaii, Alaska, and US Territories of Puerto Rico”
- alen.com/pages/certifications checked September 30, 2026
Backs: Certifications, Legal entity
“BreatheSmart 75i ENERGY STAR Certified”
- alen.com/products/alen-breathesmart-75i-air-purifier checked September 30, 2026
Backs: Clean air delivery rate (m³/h), Filter cost per year, Filter change interval, Filter types, Quietest noise level (dB), Power use (W), Room size (m²)
“BreatheSmart 75i CADR 375 - Turbo: 375 CFM, converted CFM x 1.699 = 637 m3/h”
- alen.com/products/alen-t500-tower-hepa-air-purifier checked September 30, 2026
Backs: Price from
“T500 Sale price $149.00”
Compiled from 6 source pages, checked September 30, 2026. We did not open an account.
Alen Air Purifiers
US buyers who want a single purifier sized for a large open room and will keep it running for years.