Independently tested and certified
Certified by AAFA
2025 Most Efficient
Quietest 20% on sale
93% slept better
Run it for two months. If your air, your sleep or your allergies are no better, send it back and we refund you in full. You do not need to give us a reason.
“I came online to get a new filter, which lasts over a year, and saw there was a larger, quieter system. It moves more air and is even quieter. We’ve got them in all of our bedrooms now. Major reductions in dust. Don’t even notice our allergies.”
Medical-grade H13 True HEPA pulls out the dust, pollen, dander and smoke you can see hanging in a sunbeam. It clears 1,400 sq ft every 30 minutes at 25 dB, quiet enough to leave running beside your bed all night.
93% of people in the SleepScore study slept better with one running.
Clearance: 41 units left from this batch. The sale ends tonight at midnight and we are not restocking at this price.
1. Pick your finish
Every finish, same price today
Selected: White. The panel is magnetic, so you can swap it later without tools.
2. Choose your filter
Every option is the same H13 True HEPA machine. The filter decides what else it takes out of the air.
3. Anything else?
Tick what you want in the box. It all ships in one delivery.
Shipping protection and 2 year warranty
Covers damage, loss and theft on the way to you
Run it for two months. If your air, your sleep or your allergies are no better, send it back and we refund you in full. You do not need to give us a reason.
Why people buy one
“On sunny mornings I always saw so much dust floating around the room. I shuddered to think of all the stuff I was breathing. The day I got my Alen I set it up and left it on all night. The next morning the sun came streaming in and there was absolutely nothing floating in the air.”
Dust & allergens
Pets & dander
Smoke & odour
Damp & mould
A large-room air purifier that is quiet enough to sleep beside and cheap enough to leave running. It pulls the whole room through a medical-grade H13 True HEPA filter and tells you, by colour, how dirty the air was.
The same machine, at three different jobs. Pick how hard you need it to work and read off the square footage.
4 air changes per hour
1,400 sq ft
The setting most owners run day to day. Enough turnover to keep pollen and dander from settling back out of the air.
Best for: Large bedrooms, offices, studios, classrooms
Air does not pass through closed doors. If you want a bedroom cleaned overnight, put the unit in the bedroom rather than the hallway.
Cheap purifiers hide the cost in the filters. A $120 unit that needs a $40 filter every three months costs $160 a year to run. The 75i takes one filter a year and draws as little as 1.4 watts, so after the first 12 months it is the cheaper machine to own, and it is clearing twenty times the floor area while it does it.
A vacuumable pre-filter catches hair and lint, then a medical-grade H13 True HEPA layer removes 99.9% of airborne particles larger than 0.1 micron: pollen, dust, dander, mould spores, bacteria and smoke particulate. The Ultimate filter adds an activated carbon catalyst for smoke, VOCs and household odour.
A laser SmartSensor reads PM2.5 and sets the fan speed on its own, showing air quality through a five-colour ring. Auto Light Mode dims the panel as the room gets dark, and the whole light bar can be switched off. The Alen Air app adds schedules, notifications, filter-life tracking and firmware updates.
0 PPM with the ioniser disengaged, and under 0.001 PPM with it engaged, far below the 0.05 PPM limit. The ioniser is optional and the unit is Asthma & Allergy Friendly certified by AAFA, which does not certify ozone generators.
2-year warranty, free 2-day US shipping, and a 60-day money-back guarantee. Register the unit and keep a filter subscription active and Alen's Forever Guarantee covers it for as long as you own it.
What you actually live with, day to day, once the Alen BreatheSmart 75i is in the room
25 dBA on speed 1 is below a whisper, and every speed puts out pink noise rather than a fan whine. Quiet Mark tested it into the quietest 20% of purifiers on sale, and in the SleepScore study 93% of people said they slept better with one in the room.
A laser SmartSensor reads the room and turns the ring blue through to red. You stop guessing whether it is working. You watch it go red when you cook and back to blue twenty minutes later.
The Essential filter runs 12 to 15 months at 24/7 and the Ultimate 7 to 10. The unit remembers remaining filter life even if you swap panels, and the app tells you before it matters. No cartridge subscription treadmill.
Most purifiers look like office equipment and end up hidden behind a sofa where they cannot pull air. The magnetic designer panel comes in White, Oak, Weathered Gray, Brushed Stainless, Graphite and Espresso, and swaps in seconds without tools.
Energy Star named it one of 2025's Most Efficient. Running it around the clock costs roughly the same as a couple of LED bulbs, which is the point. A purifier only works if you actually leave it on.
The Alen Air app handles schedules, air-quality alerts and filter reminders across every unit in the house. Auto Light Mode dims the panel as the room darkens, and you can switch the lights off completely while the fan keeps running.
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636 verified ratings
What buyers mention most
We use a wood burning stove for heat. On sunny mornings, when sunlight streamed through the windows, I always saw so much dust and other particulate matter floating around the room. As the afternoon sun came in the sliding glass doors there was so much stuff in the air I shuddered to think of all the stuff I was breathing. The day I received my Alen BreatheSmart air purifier I set it up and left it on all night. Imagine my amazement when the morning sun came streaming in and I saw absolutely nothing floating around in the air. Later that afternoon, same story. I am so happy with my purifier. I only wish I had bought it sooner!
I came online to get a new filter (which lasts over a year) and saw there was a larger, quieter system. So I bought this one to upgrade the older Alen in our rather large living room. It moves more air and is even quieter. The one it replaced went into my office. We've got them in all of our bedrooms now. They've been running solid for years. Our first one that I just moved is over 6 years old and as good as new still. With these we have major reductions in dust. Don't even notice our allergies. And the house always smells clean.
Living in Austin, TX, allergies are bad, like #26 worst city in the entire nation bad. Between the dogs and just the location, we are on a first name basis with our ENT and have severe allergies that turn into sinus infections at least 6x a year. It's that bad. The ENT told me to move after my allergy test. The unit itself is big, so be aware of that. Is it pretty? No. Does that matter if it works? To us, no. Make sure you buy based on your square footage. We ended up placing several around the downstairs. Don't butt them against the wall either, they need room to collect air. They are VERY easy to put together and the lights are simple to understand. Running 24/7/365 and have not had one issue at all. The main light on the top indicates air quality; red = bad, yellow = OK, blue = good. It's a great way to keep track of how the air quality is throughout the day.
A couple of weeks before we bought this, I was watching dust swirl through sunbeams in our main room when I thought, "That's what we're breathing right now!" Everyone in the family was having respiratory problems: sniffles, sneezing, asthma, itchy eyes. Now that we've had it for two months, I can say with confidence: it works. Shine a sunbeam or a flashlight through the room and the dust particles are far fewer. Everyone's breathing better. And you can see the hoards of dust on the filter when you take off the cover, and yet we haven't needed to replace it, and it looks like we have several more months to go. On the high setting it's like a room fan on medium. On the low setting it's barely noticeable. When company's over we have it on low, otherwise we leave it on auto.
I've had this since March 11. It is whisper quiet. The colors change when there's stuff in the air. Best part, it's energy efficient. Quiet, and you're not buying filters every couple of months. It does large areas. Do not let the initial price scare you. You will save money over the long run in energy bills and filters.
