The official purifier of sleep.

The BreatheSmart 45i is now as quiet as our best-in-class BreatheSmart 75i, and it’s perfectly tuned to generate soothing pink noise for up to 25% better rest. Night mode dims or disables display lighting with one-touch. And according to a SleepScore Labs study, the 45i is proven to improve sleep so you can wake up feeling more refreshed.

Don't Wonder If It's Working. Know It Is.

Auto mode allows our intelligent sensor technology to adjust to your changing environment. LED indicator always lets you know the status of the air quality around you. And when it's bedtime, lights-off mode cleans the air without disturbing your sleep.

Customized for Concern

Our antimicrobial True HEPA filters cover all major concerns: Allergies, dust, mold, bacteria, and VOCs, plus odors from cooking, pets, diapers, and sweaty apparel. Alen’s proprietary antimicrobial treatment kills bacteria and inhibits mold and fungi, while our exclusive nontoxic odor-eliminating technology destroys unwanted smells at the molecular level.

Guaranteed. Forever.

When it comes to quality, performance and customer satisfaction, we stand by our air purifiers for life. Your life. Read more about our Forever Guarantee here.


  • Clean Air Deliver Rate (CADR)
  • Cubic Feet Per Minute (CFM)
    Speed 1: 70 CFM | Speed 2: 135 CFM | Speed 3: 175 CFM | Speed 4: 215 CFM
  • Cord length
    6ft 4inches (193cm)
  • Coverage
    Up to 800 sq. ft. (74.32 m2) | Cleans all air in room every 30 minutes @ highest setting
  • Dimensions
    H 25" (63.50 cm) x W 15" (38.10 cm) x D 8.5" (21.59 cm)
  • Energy star
  • Filter cost
    $69 | Using "Pure" Filter
  • Filter life
    12 months | @ Recommended 24hr/day operation
  • Filtration rate
    Removes 99.97% of particles greater than 0.3 microns
  • Noise level
    Lowest Speed 23 dBa | Highest Speed 49 dBa
  • Ozone
    0 PPM when disengaged, less than 0.001 PPM with optional ionizer engaged
  • Power consumption
    1.1 to 50 watts
  • Power supply
    120 AV, 60HZ (2 Prong Power Cord)
  • Sensor
    Automatic speed adjustment and coordinated to 5 color rings/ 4 speeds
  • Sound type
    Pink Noise | All speeds
  • Speed settings
  • Warranty
    Lifetime | with Product Registration & Active Filter Subscription
  • Weight
    15 lbs (6.8 kg)

What's in the box

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