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Alen BreatheSmart 45i Air Purifier

Elevate your indoor wellness with Alen’s bestselling True HEPA (H13) air purifier—featuring advanced particle sensor technology. The 45i quietly purifies up to 800 SqFt of air every 30 minutes, removing 99.99% of dust, allergens, aerosolized viruses, and other contaminants down to 0.1 microns. As a SleepScore Validated product, the 45i has been shown in studies by SleepScore Labs to helped people achieve better sleep and feel they have fewer allergy symptoms.

If this product does not meet your standards, it may be returned within 30 days.

FREE USA Shipping

Excludes Alaska and Hawaii. We ship to Canada.

Quick Details

  • Validated by SleepScore Labs - See Results
  • Sleep Superbly– Dim or darken lights at bedtime & doze off to soothing pink noise for enhanced rest
  • Know it’s Working- See real-time air quality in 5 vivid LED colors as Auto mode optimizes speeds 24/7
  • Tailored to You- Antimicrobial True HEPA (H13) filter options to target chemicals (VOCs), smoke, and odors
  • Breathe Beautifully- Accent your décor with a diverse selection of designer panel options
  • Guaranteed Forever- Lifetime peace of mind from the industry’s only lifetime warranty

Product Features

  • Smart Particle Sensor: 5 color rings  
  • Filter life indicator 
  • Power/Sleep Mode 
  • 4-speed fan 
  • Lock
  • Handle for easy moving 
  • Energy Star Certified 
  • CARB Compliant 

New Design. Improved Sensor Technology. More Powerful Than Ever.

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.

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 yet quiet airflow, ensuring pure air for your entire room. As an added safeguard, Alen’s proprietary antimicrobial treatment kills mold and bacteria.

Guaranteed. Forever. 

When it comes to quality, performance and customer satisfaction, Alen stands by their air purifiers for life. Your life. 


  • Coverage Area (Max Speed): Allergens in the air can wreak havoc on our sleep. Fortunately, according to self-reported data and objective sleep data measured using SleepScoreTM by ResMedTM technology, the Alen BreatheSmart 45i could really help you sleep better.
  • Filtration rate: Removes 99.99% of particles greater than 0.1 microns 
  • CFM (airflow in Cubic Feet per Minute): Speed 1: 70 CFM;  Speed 2: 135 CFM;  Speed 3: 175 CFM;  Speed 4: 215 CFM;
  • CADR: 245
  • Noise levels (Max Speed): Lowest Speed 23 dBa | Highest Speed 49 dBa 
  • Power consumption: 1.1 to 50 watts
  • Power supply: 120 AV, 60HZ (2 Prong Power Cord) 
  • Filter life: 12 months | @ Recommended 24hr/day operation 
  • Size: 25" x 15" x 8.5" 
  • Weight: 15 lbs 

Package Contents

  • BreatheSmart FLEX air purifier
  • HEPA-Pure filter
  • Designer panel (optional)
  • Quick start guide

SleepScore Validated

Better sleep with SleepScore

SleepScore Validated products have been shown to improve sleep in SleepScore Labs’ extensive studies. This is your assurance that the product works as described for many people and has been evaluated at a higher level than the rest of the curated products.

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