Cleans 800 SqFt Every 30 Minutes

Alen’s best-selling air purifier features best in class quietness and is perfectly sized for medium-sized rooms like bedrooms and common spaces in apartments, condos, or lofts. It was the first air purifier to earn validation from SleepScore Labs for helping people achieve better rest.

Don’t wonder if it’s working, know it is.

Alen’s advanced particle sensor technology always lets you know the status of the air quality around you with vivid LED color rings. And when harmful particles are detected, Auto-mode adjusts purifying power to keep your air pure 24/7. 

Medical-Grade Protection

Long-lasting True HEPA (H13) filters remove 99.99% of airborne contaminants down to 0.1 microns, including allergens and aerosolized viruses. Alen’s medical-grade filtration is highly effective thanks to powerful airflow, ensuring pure air for your entire room. As an added safeguard, Alen’s proprietary antimicrobial treatment kills mold and bacteria.

Lifetime Peace of Mind

When you purchase an Alen air purifier, we proudly support it with the industry’s first and only lifetime warranty. If anything goes wrong, our in-house experts will help you solve the problem. If they can’t, we’ll happily ship you a free replacement—fast!

Discover Better Rest

Proven to improve sleep and reduce allergies, the BreatheSmart 45i helped people fall asleep faster, sleep sounder, and wake feeling more refreshed in a peer-reviewed study by SleepScore Labs. 45i is incredibly quiet and perfectly tuned to generate soothing pink noise—for up to 25% better rest. And at bedtime, display lighting dims or darkens with one touch.


  • Coverage
    Up to 800 sq. ft. (74.32 m2) | Cleans all air in room every 30 minutes @ highest setting
  • Filtration rate
    Removes 99.99% of particles greater than 0.1 microns
  • Noise level
    Lowest Speed 23 dBa | Highest Speed 49 dBa
  • Sound type
    Pink Noise | All speeds
  • Speed settings
  • Sensor
    Automatic speed adjustment and coordinated to 5 color rings/ 4 speeds
  • Cubic Feet Per Minute (CFM)
    Speed 1: 70 CFM | Speed 2: 135 CFM | Speed 3: 175 CFM | Speed 4: 215 CFM
  • Clean Air Deliver Rate (CADR)
  • Filter life
    12 months | @ Recommended 24hr/day operation
  • Filter cost
    $69 | Using "Pure" Filter
  • Ozone
    0 PPM when disengaged, less than 0.001 PPM with optional ionizer engaged
  • Power supply
    120 AV, 60HZ (2 Prong Power Cord)
  • Cord length
    7ft 8inches (233cm)
  • Power consumption
    1.1 to 50 watts
  • Energy star
  • Dimensions
    H 25" (63.50 cm) x W 15" (38.10 cm) x D 8.5" (21.59 cm)
  • Weight
    15 lbs (6.8 kg)
  • Warranty
    Lifetime | with Product Registration & Active Filter Subscription

What's in the box

  • BreatheSmart 45i air purifier
  • 45i True HEPA filter
  • Designer panel (optional)
  • Quick start guide

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