BreatheSmart 25i

$179
BreatheSmart 25i
$179.00
$179.00
We recommend the product and filter below.

BreatheSmart 25i

HSA|FSA Eligible

Product Description

Ready for anything and sized for anywhere, the whisper-quiet 25i packs all the power and latest smart features into our most compact size. Perfect for purifying a small living space or amplifying your current purifier setup, the 25i is sized to give you ultimate flexibility.

$179.00
We recommend the product and filter below.
  • Alen BreatheSmart 25i Air Purifier
  • Alen BreatheSmart 25i Air Purifier
  • Alen BreatheSmart 25i Purifier
  • Alen BreatheSmart 25i Air Purifier
  • Alen BreatheSmart 25i Air Purifier - Open panel
  • Alen BreatheSmart 25i Air Purifier - Replace filter
  • Alen BreatheSmart 25i Air Purifier - Back
  • Alen BreatheSmart 25i | Size
  • Alen BreatheSmart 25i
  • Alen BreatheSmart 25i
1 14

BreatheSmart 25i

BreatheSmart 25i
HSA|FSA Eligible ? *One-time purchase only

Ready for anything and sized for anywhere, the whisper-quiet 25i packs all the power and latest smart features into our most compact size. Perfect for purifying a small living space or amplifying your current purifier setup, the 25i is sized to give you ultimate flexibility.
$179.00
$179.00

Customize to your style and needs:

Filter

Help me choose

Our entry-level filter. Features a medical-grade HEPA filter that captures 99.9% of airborne dust, viruses, and allergens.​
Recommended
$39.60
  • Save 10% on future filter refills
  • Skip, modify, or cancel anytime
  • Worry-free delivery every

I'll subscribe later

Our Forever Guarantee policy requires the use of Alen filters for your purifier. Learn More

FREE 2-Day Shipping

FREE 2-Day Shipping

Lifetime Warranty

Lifetime Warranty

60-Day Trial

60-Day Trial

  • BreatheSmart 25i Air Purifier
  • Long-Lasting HEPA Filter
  • Power Adapter
  • Quick start guide
  • User Manual

CADR i Clean Air Delivery Rate.

107

CFM i Cubic Feet per Minute

Speed 1: 45 CFM|Speed 2: 70 CFM| Speed 3: 90 CFM| Turbo: 120 CFM

Coverage

Purifies up to 800 sq ft every hour or 400 sq ft every thirty minutes

Dimensions

H 16.8" W 11" D 7.3"

Energy star i Products/Homes/Buildings that earn the ENERGY STAR prevent greenhouse gas emissions by meeting strict energy efficiency guidelines set by the U.S. Environmental Protection Agency and the U.S. Department of Energy

Yes

Filter cost

$44 | Using "Essential" Air Filter

Filter life max

@ Recommended 24/7 operation Essential: 9-12 months Advanced/Ultimate: 6-8 months

Filtration rate

Captures 99.9% of airborne particles as small as 0.1 micron

Ionizer

No

Noise level

Lowest Speed - 20 dB | Highest Speed - 40 dB

Ozone

0 PPM

Power consumption

0.8 to 20 watts

Power supply

24V, External Power Supply | Cord length: 6ft 9 inches (200cm)

Sensor

Automatic speed adjustment and coordinated to 5 color rings/ 4 speeds

Speed settings

4

Warranty

Forever Guarantee | with Product Registration & Active Air Filter Subscription

Weight

8 lbs

We offer standard payment options with credit or debit card, PayPal, GPay, and Apple Pay, in addition to Buy Now, Pay Later options that are available with ShopPay. FSA/HSA payment is available to eligible customers through Flex.

View full details

Meet our filters

Essential (Pure)

Advanced (Fresh)

Ultimate (Odor)

The filter that started it all. Our entry-level filter features medical-grade HEPA filtration that captures 99.9% of airborne dust, viruses, and allergens.​

For when you want a little more control. Includes medical-grade high efficiency particulate (HEPA) filtration from the Essential filter, plus a carbon layer providing protection against asthma triggers, chemicals and VOCs, smoke, and other common pollutants..​

Your comprehensive clean-air solution. Our top-tier filter features a medical-grade, high efficiency particulate (HEPA) material with a powerful carbon & catalyst layer for broad performance against asthma triggers, chemicals and VOCs, smoke, pollutants, odor, mold, and pet-filled homes. 

Essential (Pure)

The filter that started it all. Our entry-level filter features medical-grade HEPA filtration that captures 99.9% of airborne dust, viruses, and allergens.​

Advanced (Fresh)

For when you want a little more control. Includes medical-grade high efficiency particulate (HEPA) filtration from the Essential filter, plus a carbon layer providing protection against asthma triggers, chemicals and VOCs, smoke, and other common pollutants..​

Ultimate (Odor)

Your comprehensive clean-air solution. Our top-tier filter features a medical-grade, high efficiency particulate (HEPA) material with a powerful carbon & catalyst layer for broad performance against asthma triggers, chemicals and VOCs, smoke, pollutants, odor, mold, and pet-filled homes. 

See also

20%

Ranked in the quietest 20% of air purifiers on the market.

Quiet Mark Certified

Quiet Mark Certified

Up to 5x

Indoor air pollutant levels can be 2 to 5 times higher than outdoor levels.

Asthma & Allergy Friendly

Asthma & Allergy Friendly

Certified

Achieved Energy Star's 2025 'Most Efficient'

Energy Star

Energy Star

What others are saying

Control your air from anywhere 

Alen Air App

Monitor your air quality in real time and control your Alen air purifiers from one intuitive interface. Set alerts, adjust settings, and schedule effortlessly.

Learn More

Deeper insights with airID

airID uses AI-powered optical technology to detect, identify, and measure air particles so you can track pollutants like dander, smoke, pollen, and smog.

Learn More

Quiet and very efficient. It was shocking to see how much dust it collected.

Jeff

Noticed a big difference in my bedroom the next morning after setting up. My eyes feel better and aren’t red anymore. Room also smells better.

Cindy

I love this machine and the company customer service was awesome ~ best investment !!!

Janice

Picture the perfect spot for your
BreatheSmart 25i

Home Office

Purpose-built for focused work, the 25i purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes, keeping your home office clean and quiet 

Dorm Room

Proven to supports more restful sleep, the 25i purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes, so your air stays pure all year long. 

Nursery

With quiet-yet-powerful fans perfect for nap time, the 25i purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes, so your baby's space is always allergen-free. 

Picture the perfect spot for your

BreatheSmart 25i

Purpose-built for focused work, the 25i purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes, keeping your home office clean and quiet 

Proven to supports more restful sleep, the 25i purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes, so your air stays pure all year long. 

With quiet-yet-powerful fans perfect for nap time, the 25i purifies up to 800 sq ft every hour or 400 sq ft every 30 minutes, so your baby's space is always allergen-free. 

Home Office
Dorm Room
Nursery
BreatheSmart 25i BreatheSmart 25i
BreatheSmart 75i BreatheSmart 75i
BreatheSmart 45i BreatheSmart 45i
BreatheSmart 35i BreatheSmart 35i

A purifier for every space.

Compare Models

FAQs

How often do I need to change the filters for BreatheSmart 25i?

Depending on usage, we recommend changing the filter every 6-12 months. The 25i comes with smart sensors that monitor air quality and will alert you through the app when it’s time to replace the filter.

What are the benefits of upgrading to the 25i if I already own another air purifier?

The BreatheSmart 25i offers modern upgrades like quieter operation (20-40 dB), better smart features (AQI monitoring), and the ability to control multiple units through the app. With an active filter subscription, it is also covered by a Forever Guarantee, so it’s a long-term investment.

How many fan speeds does the 25i have?

The BreatheSmart 25i comes with four fan speeds, ranging from a whisper-quiet low setting at 20 dB to a higher power setting that still remains under 40 dB, ensuring customizable comfort without disrupting your space.

How does the BreatheSmart 25i smart filter system work?

The 25i uses smart filters that communicate with the purifier, tracking filter life and letting you know when it’s time for a replacement. The app also allows you to monitor filter status.

How does the BreatheSmart 25i compare to other Alen Air Purifer models?

The BreatheSmart 25i is the most compact and affordable model in the smart purifier lineup. It offers advanced filtration with a quiet motor, smart sensors, and app control—making it perfect for smaller spaces like bedrooms.

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