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Bring Utopiair™ to any space
The power-packed BreatheSmart 35i is our smallest, quietest, most affordable smart purifier yet. Take control of your air and breathe better every day without compromise.
Buy NowBring Utopiair™ to any space
The power-packed BreatheSmart 35i is our smallest, quietest, most affordable smart purifier yet. Take control of your air and breathe better every day without compromise.
Buy Now
Our quietest purifier yet
At only 42 decibels at max power, this whisper-quiet unit purifies your air without disrupting your peace. It emits a soothing pink noise that creates a relaxing environment – ideal for better sleep.
Forever Guarantee
Alen air purifiers are covered by the Alen Forever Guarantee, our industry-leading lifetime warranty. If anything goes wrong with your Alen air purifier, we’ll repair or replace your Alen for free.
Purpose-built filters
Optimize your Alen for your specific environment to create your Utopiair™. Choose from two filter options designed to address your needs.
Clean air you can see
Our medical-grade HEPA filters remove 99.9% of dust, allergens, and harmful pollutants down to 0.1 micron.
Alen air purifiers are designed to run 24/7, constantly monitoring air quality using laser-sensor technology. Our LED color ring changes color to let you know when detected particles are impacting your air quality, and your Alen will auto-adjust fan speed to capture those particles quickly.
Smart Sensors
Track PM2.5, TVOC, eCO2, temperature, and humidity levels in your air. Set up notifications based on thresholds you set.
Powerful Filtration
Purify up to 1,000 sq ft in one hour, or 500 sq ft every 30 minutes.
Detailed Control
Change single or multiple settings across multiple devices through the Alen Air app. Create schedules for your purifiers that match your routines.
Smart RFID Filters
Keep track of remaining filter life, even when you swap filters.
Auto Light Mode
Dims panel lights automatically when the room is dark and brightens when the room lights up.
Ongoing Firmware Enhancements
Get updates through the Alen Air app.
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Whisper Quiet
Enjoy soothing pink noise for better sleep.
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Know It’s Working
See real-time changes in air quality through LED colors.
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Stay In Control From Your Phone
Connect to WiFi to monitor air quality history and control remotely.
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Big purification for small spaces
Ideal for city apartments, loft spaces, studios, and dorm rooms, the 35i purifies up to 1,000 sq ft every hour or 500 sq ft every 30 minutes.
A filter for every concern
Choose the filter that fits your needs.
Not sure which filter is right for you?
Pure Filter
Compatible with 75i, 45i, 35i, & FLEX models
Alleviate asthma and allergy symptoms
Allergen-free air for healthier living
- Medical-grade HEPA: Laboratory tested to capture 99.9% of irritating allergens including pollen, dust, and mold spores.
- Targeted filtration: Engineered to trap fine particles that trigger allergy symptoms, helping you breathe with ease.
- Designed for comfort: Emphasizes a reduction in inflammation and symptom alleviation for a healthier indoor experience.
Fresh Filter
Compatible with 75i, 45i, 35i & FLEX models
Reduce dust, chemicals, and smoke
Protection against harmful chemicals, VOCs, and smoke
- Medical-grade efficiency: Clinically proven to capture 99.9% of irritating allergens including pollen, dust, and mold spores.
- Enhanced activated carbon: Activated carbon helps absorb strong odors, chemicals, and smoke.
- Optimized for chemical protection: Specially designed to tackle smoke-related pollutants and harmful chemicals.
What our customers are saying
When your air is perfect for you. That’s UTOPIAIR™.
Unsure which model and filter is right for you?
Take the quiz to determine what model is right for your room size and coverage needs, as well as which filter is right for your specific concerns.
Compare models
Not sure which model is right for you?Take the quiz
BreatheSmart 35i
Big power for small spaces, at the best value.
Coverage
500 - 1,000 sq ft
Compatible filter types
Pure & Fresh
What’s Included?
- BreatheSmart 35i air purifier
- 35i HEPA air filter
- Quick start guide
- User manual
- Power adapter
BreatheSmart 75i
Ideal for most large living rooms
Coverage
1,400 - 2,800 sq ft
Compatible filter types
Pure, Fresh, & Odor
What’s Included?
- BreatheSmart 75i air purifier
- 75i HEPA air filter
- Designer panel (optional)
- Quick start guide
BreatheSmart 45i
Ideal for open-concept spaces & living rooms
Coverage
800 - 1,600 sq ft
Compatible filter types
Pure, Fresh, Odor & VOC/Smoke
What’s Included?
- BreatheSmart 45i air purifier
- 45i HEPA air filter
- Designer panel (optional)
- Quick start guide
FAQs
What makes the Alen BreatheSmart 35i different from other air purifiers?
The Alen BreatheSmart 35i combines advanced HEPA filtration technology with optimized airflow for maximum efficiency and minimal noise. This allows for whisper-quiet removal of particulate matter, even on the highest setting, 24/7.
What is included with the BreatheSmart 35i purchase?
The BreatheSmart 35i package includes the air purifier unit, a preinstalled filter, and a user manual. Additional filters can be purchased separately.
How large of an area can the BreatheSmart 35i cover?
The BreatheSmart 35i is designed to purify spaces up to 1,000 sq ft cycling air once an hour, or 500 sq ft cycling air once every 30 minutes.
Does the Alen BreatheSmart 35i come with a warranty?
Yes, the 35i comes with Alen's Forever Guarantee. This lifetime warranty covers any manufacturing defects when you maintain an active filter subscription service. If your purifier ever needs repair, Alen will fix or replace it for free.
How can I trust the Alen brand?
We are committed to transparency and customer satisfaction. You can find over 5,000 reviews on our website and third-party platforms that attest to the quality and reliability of our products.
How does the 35i compare to other brands?
The BreatheSmart 35i offers superior performance with advanced HEPA filtration, quieter operation, and the Forever Guarantee, which many competitors do not offer.
How effective is the 35i at improving sleep?
The BreatheSmart 35i’s incredibly quiet operation emits a soothing pink noise, which enhances lower frequency sounds, helping you wake up feeling more rested.
Still not sure? Ask our experts
Get more help on Alen.com
Have questions? Our Alen support team is just a click or call away.
Have questions? Our Alen support team is just a click or call away.
Give us a call 1-800-630-2396
