Alen 35i HEPA Air Purifier, Advanced Filter, Covers 1,400 Sq Ft
Alen 35i HEPA Air Purifier, Advanced Filter, Covers 1,400 Sq Ft
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Alen 35i HEPA Air Purifier, Advanced Filter, Covers 1,400 Sq Ft

12 ratings

Key item features

  • Advanced Filtration: Features an H13 HEPA Advanced filter, capturing particles down to 0.1 micron, including dust, pollen, allergens, and mold. It also absorbs harmful chemicals, VOCs, and household odors.
  • Broad Coverage: Efficiently purifies air in spaces up to 1000 sq ft per hour or 500 sq ft in thirty minutes, suitable for large rooms and office environments.
  • Smart Sensing: Equipped with a SmartSensor that automatically adjusts fan speed based on air quality, providing color-coded feedback.
  • Quiet Operation: Operates with an ultra-quiet motor, emitting soothing pink noise, and is ranked among the quietest 20% of air purifiers.
  • Sleep Enhancement: Proven by SleepScore Labs to enhance sleep quality, its quiet pink noise operation optimizes lower octave frequencies for restful nights.
  • Energy Efficient: Engineered for continuous 24/7 use, this purifier maintains air quality economically at an approximate cost of $0.12 per day.
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Specs

Filter type, HEPACoverage area, 1400 sq ftClean air delivery rate, 190 CFMContaminants removed, Allergens, Dust, Viruses, SmokeMicroparticle performance rating, 99.97Brand, Alen

About this item

Product details

Alen BreatheSmart 35i with H13 HEPA Advanced air filter - Absorbs harmful chemicals and VOCs, cooking odors, and common household odors & captures allergens, dust and mold. Purifies up to 1,000 sq ft every hour or 500sq ft every thirty minutes. The ideal combo for those seeking HEPA protection and relief from common irritants like dust, pollen, and hair with added carbon to protect against harmful VOCs from smoke and household items. Ranked in the quietest 20% of air purifiers on the market.
  • H13 Filtration: Utilizes an H13 HEPA Advanced filter to capture particles as small as 0.1 micron, including dust, pollen, allergens, and mold from your environment.
  • Expansive Coverage: Designed to efficiently purify air in spaces up to 1000 sq ft every hour, or 500 sq ft in thirty minutes, making it suitable for large bedrooms, living rooms, dining rooms, and office environments.
  • Smart Air Purification: SmartSensor adjusts fan speed based on air quality, with color-coded feedback. Blue rings indicate excellent air quality levels while purple rings indicate high particle presence
  • Sleep Optimized: The 35i is proven by SleepScore Labs to enhance sleep according to a peer study. Its ultra-quiet operation emits pink noise, optimizing lower octave frequencies, and ensuring a restful night. An excellent addition to air purifiers for bedroom for undisturbed, quality sleep, so you wake up feeling rested
  • Peaceful Operation: Ultra-quiet operation from a quiet motor emits soothing pink noise. Ranked among the quietest 20% of air purifiers.
  • Energy Conscious: Designed for 24/7 continuous use, operating at an energy cost of only $0.12 per day, providing constant air purification economically.
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Specifications

Filter type

HEPA

Coverage area

1400 sq ft

Clean air delivery rate

190 CFM

Contaminants removed

Allergens, Dust, Viruses, Smoke

Warranty

Warranty information

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Customer ratings & reviews

4.3 out of 5 stars
stars
12 ratings11 reviews
How item rating is calculated
  1. 5 stars67% (8)
  2. 4 stars17% (2)
  3. 3 stars8% (1)
  4. 2 stars0% (0)
  5. 1 star8% (1)

Reviews summary

Neutral

  • : Can be quiet, but may produce hissing and vibrating sounds.
  • : Offers robust features, but can be glitchy.
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Showing 1-3 of 11 reviews

Jul 5, 2026
Reviewer name: anonymous
Item details
Configuration: Odor
Actual Color: White
Sold and shipped byAlen
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

The only one that detects cigarette smoke!

I wished I bought this much sooner and did not waste money on others but it is expensive. I was able to get it during the last sale. It is the quietest!!! It is also the only one that actually detects cigarette smoke; the color changes!!! I wish the auto mode would go on super speed as soon as it drops from green (cleanest). Btw, I have not even connected to wifi/app. And there was email about how they're getting rid of something in the app; double check if that's important to you. I will probably only want to make sure I can turn it on/off while away. It's always on high speed when it's on because i have neighbors who want to give me lung cancer. Can i sue them? I am saving up and waiting for a sale to get the 75i for open living room plus kitchen

Incentivized Review
Helpful?5CQRASF47ZDX17089565240
Jun 25, 2026
Reviewer name: Coco
Item details
Configuration: Fresh
Actual Color: White
Sold and shipped byAlen
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

I have only had this one day and I can already feel the in how me and my daughter are breathing at night! It was very easy to set up. Just plug it in basically. Trying to get it to connect to my WiFi on the app took a few tries but other than that I have no complaints. I am a light sleeper and the sound while not completely silent it's low enough for me that it doesn't bother me at all. I have this one in my bedroom and it quickly clears smells that come upstairs from the kitchen. I really wish I would have invested in an air purifier sooner! It's also light weight I have muscle weakness so I have trouble picking things up and carrying them but this was very easy for me to handle and move to the perfect spot in my room. So far I really have zero complaints and would purchase again.

Incentivized Review
Helpful?5CQRASF47ZDX17089565240
Current price is $289.00
Price when purchased online
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  • Free Holiday returns until Jan 31
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Sold and shipped by Alen
4.363636363636363 out of 5 stars
4.4 stars out of 5, based on 11 seller reviews(4.4)
Extended holiday returns
Free Holiday returns until Jan 31