Alen
BreatheSmart Flex
Based on 28 Reddit mentions
$349.00
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Most discussed features
Sentiment summary across the product areas Reddit users mention most.
Reddit mentions
Original Reddit posts and comments behind this analysis.
Looking for a basic, no frills purifier
The Flex model has carbon, I have one. You choose the filter you want. So you get their best filter, I think 90 bucks at 450i size, has carbon + more material than most affordable hepa units. 60 dollars is just hepa. They have a middle one in between for like 70 or 80. So for good carbon, get the be
...Person51389 in r/AirPurifiers
August 10, 2026 5:28 AM
2
My first air purifier for my living room! Help!
I would look into Alen 45i Flex, or units from Winix, Levoit, or Coway. Alens are quiet and good for both VOCs + particulates, with their best filters, and come with a lifetime warranty if you stay in the filter replacement program. (I think 90 bucks every 9 or 12 months, your choice.). However if y
...Person51389 in r/AirPurifiers
May 10, 2026 1:20 PM
2
Best air purifier for allergies that'll actually last?
Alen 45i Flex, so Alen has a lifetime warranty if you stay in filter replacement program. One of the only brands in the industry with a lifetime warranty. It doesn't move air super-fast though, but slow and steady. Aldo I think 400-450 with the Flex being 50 cheaper with no smart features + no ioniz
...Person51389 in r/AirPurifiers
July 30, 2026 4:24 PM
1
Looking for a basic, no frills purifier
Alen 350i or 450i, the 450i Flex has no ionizer and no smart features, and is 50 dollars cheaper. The 350i might be big enough, definitely for smaller room. So they have more carbon in them than most hepa based units, if you get their best filter. However, VOC focused in will still have far, far mor
...Person51389 in r/AirPurifiers
August 9, 2026 7:17 PM
1
Stay Away From Mila Air...
This is frustrating although it seems a little harsh as to Mila Air though imo. As most purifers break eventually, and the industry standard is pretty much just a 1 year warranty for most cheap/random brands. A lot of units will fail within 5ish years if used heavily probably, and I had many random
...Person51389 in r/AirPurifiers
June 11, 2026 5:11 PM
1
Air purifier for 10x12 nursery
I have the Alen 25i in my office and would also be great for a small nursery. Only 40 db at its highest setting which is great for babies since you want to keep it under 50 db. I also really like how it sounds. A 35i or flex would also be a great choice. I like the flex because it’s a 45i without al
...NumerousAssumption47 in r/AirPurifiers
January 23, 2026 3:49 AM
1