Alen

Alen BreatheSmart 75i

A from Alen, with H13 True HEPA filtration, rated for rooms up to 1300 sq ft.

Who this is for:Shoppers looking for a purifier suited to large living rooms and open-plan spaces. If odors, pet smells, or smoke gases are a concern, this model includes activated carbon.

Owners like this air purifier because it's good for pet hair and dander, it runs quietly enough to fade into the background, and it's good value for money.

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Key specs

New to these numbers? Read What is CADR? and Decibels, translated

Room coverageiThe largest room, in square feet, this purifier can effectively clean — assuming standard 8-foot ceilings and 4–5 air changes per hour.Room size guide →1300 sq ft

Noise rangeiDecibels (dB) measure loudness on a scale where every +10 dB sounds roughly twice as loud. 20 dB is a whisper, 40 dB a quiet library, 60 dB normal conversation. For bedrooms, look for under 30 dB on the lowest setting.Noise guide →25–49 dB

Who the Alen BreatheSmart 75i is for

Specs only matter in context. Here's where the Alen BreatheSmart 75i genuinely fits — and the trade-offs worth knowing before you buy. If you're deciding between this model and similar options, focus on the fit cards below: they highlight the specific use cases where this purifier shines and the situations where it falls short.

Good fitBedrooms and light sleepersAt 25 dB on its lowest setting, the Alen BreatheSmart 75i clears the 30 dB bedroom bar — roughly a whisper.
Good fitOdors, pets, and smokeAn activated carbon stage traps the gases a particle filter can't — cooking smells, litter-box odor, VOCs, and wildfire smoke gases.
Good fitAllergy and asthma householdsA True HEPA filter captures 99.97% of particles at 0.3 microns — pollen, dander, dust mite debris, and most smoke. Run it continuously for real symptom relief.
Good fitSet-and-forget operationListed features include laser smart sensor, auto mode, Alen Air app (newer V2), LED AQ display — handy for letting the purifier manage itself, though none of it replaces CADR headroom.
Keep in mindCADR is self-reportedThe Alen BreatheSmart 75i isn't AHAM Verifide, so its CADR and coverage figures come from the manufacturer rather than an independent lab — treat them as a ceiling, not a promise.

What owners say

4 recommendations

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5.0 out of 5 starsr/Pets
“The 75 is almost silent.”
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5.0 out of 5 starsr/AirPurifiers
“Incredibly quiet and works great.”
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4.0 out of 5 starsr/homemaking
“I like that there's a little color indicator at the top that tells us the air quality.”
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4.0 out of 5 starsr/BuyItForLife
“I would buy the 75i again hands down.”
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Compare with similar models

These alternatives share key traits with the Alen BreatheSmart 75i — same brand family or similar room coverage. Compare their scores, owner sentiment, and specs side by side to see which fits your specific needs better.

Common questions about the Alen BreatheSmart 75i

Quick answers to the questions shoppers most often ask before buying. If your question isn't covered here, check the full specifications below or compare against similar models above.

What size room can the Alen BreatheSmart 75i handle?It's rated for rooms up to 1300 sq ft.
Is the Alen BreatheSmart 75i quiet enough for a bedroom?Yes — 25 dB on the lowest setting is under the 30 dB threshold most sleepers need, roughly a whisper. On high it reaches 49 dB, so size it to run on low or medium overnight.
Can the Alen BreatheSmart 75i handle odors and smoke?Yes — its activated carbon stage traps odor and VOC gases while the H13 True HEPA filter handles the particles, which is the combination smoke and pet households need.

Full specifications

filter typeiThe particle filter grade. True HEPA captures 99.97% of particles at 0.3 microns; 'HEPA-type' has no standardized efficiency.Filter guide →: H13 True HEPA
model numberiThe manufacturer's exact model identifier — handy when comparing listings across retailers.: BreatheSmart 75i
noise db maxiThe loudest fan setting, in decibels. 60 dB is normal conversation; above that you'll hear it across the room.Noise guide →: 49
noise db miniThe quietest fan setting, in decibels. 20 dB is a whisper, 40 dB a quiet library — for bedrooms, look for under 30 dB here.Noise guide →: 25
smart featuresiExtras like air quality sensors, auto mode, app control, and sleep modes. Nice to have — they don't clean the air themselves.Smart features guide →: laser smart sensor, auto mode, Alen Air app (newer V2), LED AQ display
room coverage sqftiThe largest room, in square feet, this purifier can effectively clean — assuming standard 8-foot ceilings and 4–5 air changes per hour.Room size guide →: 1300
has activated carboniActivated carbon traps gases, odors, and VOCs that HEPA filters can't catch — essential for smoke, cooking smells, and pet odor.Filter guide →: True