Most discussed features
Sentiment summary across the product areas Reddit users mention most.
Reddit mentions
Original Reddit posts and comments behind this analysis.
Anyone with experience with alen air purifiers.
I’m using Alen 45i and 35i in our home and they work great. we have 2 cats and these machines remove any pet and cooking odors. filter needs to be replaced once a year. Having an app makes it handy to check or change settings as needed, also has a schedule option. good machines for the money.
Opposite_Yard_1857 in r/AirPurifiers
March 24, 2026 at 12:28 a.m.
3
Looking for air purifier for cat smell
Purifiers under 200 wont do much for odors unfortunately. Or not for very long. You need thicker filters with black carbon pellets -these absorb odors. The normal white filters in most purifiers just capture particles. Does nothing for odors. Under 200 dollar units will fair chance have a thin carbo
...Person51389 in r/AirPurifiers
March 17, 2026 at 4:42 p.m.
3
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 at 5:28 a.m.
2
ALEN BreatheSmart Flex for bedroom
I have an Alen 35i, which is a smaller and newer model than what you’re looking at. It runs very quietly for the bedroom. This brand is pretty high-end, though, and if you’re not picky about which boxes need to be checked, you can certainly find something cheaper that filters the air equally well.
puffic in r/AirPurifiers
April 27, 2026 at 8:35 p.m.
2
Anyone with experience with alen air purifiers.
I've wanted Alen for years. Got the 75i and 35i. 35i was fine, but not that impressed with odor removal and I have the ultimate filter. Small kitchen and if I cook a burger, the smell is still there in the morning-even on turbo. 75i makes a knocking sound even on the lowest speed and that is right o
...blues2u in r/AirPurifiers
June 2, 2026 at 2:47 a.m.
2
Thoughts on this air purifier?
This stuff is so fascinating! I've also stumbled upon BreatheSmart 35i and the Coway Airmega AP-1512HH. Our living room is 25' x 20' x 10' (ceilings). I'll check out those Winix ones and can hopefully afford to get 2. Bonus that the Alen's are FSA/HSA eligible.
toysofvanity in r/AirPurifiers
March 5, 2026 at 10:42 p.m.
2
Looking for plain HEPA filter to reduce cigarette smoke content, no ionizer options please!
HEPA purifiers reduce the particulate component of cigarette smoke, especially fine PM2.5 and even a portion of ultrafine particles, but they don’t eliminate gaseous toxins or all odors. You would need plenty of sorbent media for the latter. You could try a Levoit Vital 200S-P, it’s $20 cheaper at V
...xPurplexAnarchyx in r/AirPurifiers
March 31, 2026 at 7:08 p.m.
2
Need a filter for odors please deadly allergic
The ventilator is a good idea as someone else suggested, as no purifier under 200ish bucks will do much for odors. A good unit for odors is an Alen45i, but it's 350 bucks. An Alen 35i I think is 290. One of the best is AustinAir and they are 750. So is suggest Austin Air, or maybe an Alen. For a ven
...Person51389 in r/AirPurifiers
March 13, 2026 at 12:00 a.m.
2
Looking for a basic, no frills purifier
I'm trying to look for the Flex model's product page on the Alen site but can't find it. Did they discontinue this line or something? Ebay third-party sellers way overcharge the Alen products. I'd have to pay 2-3 times as much to buy a 35i model from Ebay as I would from the Alen website, while not
...Iris-Sofia in r/AirPurifiers
August 10, 2026 at 6:19 a.m.
1
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 at 4:24 p.m.
1