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The Alen BreatheSmart 45i is ideal for bedrooms and other rooms up to 800 sq. ft. Proven to improve sleep by and independent SleepScore Labs study, the BreatheSmart 45i emits a soothing pink noise that boosts frequencies in the lower octaves, so you wake up feeling rested. Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration technology to deliver and maximize airflow while minimizing noise. Our medical-grade filters capture particles as small as 0.1 micron, removing even the tiniest pollutants including dust, pollen, pet dander, mold spores, germs and bacteria, and more. Laser sensor technology detects when particles are present and auto-adjusts fan speed, so you don’t have to. The 5 color coded rings show your indoor air quality at a glance and let you see how Alen is working to clean the air quickly and efficiently. Get real time air quality insights, view historical trends, or control your purifier remotely using the Alen Air app. Alen air purifiers are backed by the industry’s only Forever Guarantee.
A: The BreatheSmart 45i uses a True HEPA filter, which is 99.9% efficient at capturing particles down to 0.1 microns in size. This includes dust, allergens, pollen, pet dander, mold spores, germs, and bacteria.
A: The BreatheSmart 45i improves sleep quality by emitting a soothing pink noise that boosts frequencies in the lower octaves. This is supported by a peer-reviewed study conducted by SleepScore Labs, which found that the BreatheSmart 45i significantly improved sleep quality in participants.
A: Yes, the BreatheSmart 45i air purifier has a Fresh Filter that uses activated carbon to mitigate common household odors and absorb light chemicals and VOCs. This filter is particularly effective in removing light household odors, cooking smells, and chemicals.
A: The BreatheSmart 45i measures 15 inches in width, 25 inches in height, and 8.5 inches in depth. It weighs 15 pounds. Compared to other air purifiers, it is considered to be relatively compact and lightweight, making it suitable for use in various room sizes.
A: The noise level of the BreatheSmart 45i on its highest setting is equivalent to the sound of gentle rainfall. Compared to other air purifiers, it operates quietly, allowing for a peaceful environment.
Q: How much energy does the BreatheSmart 45i consume, and how much does it cost to operate per day?
A: The BreatheSmart 45i consumes 50 Watts of energy on its highest setting. Operating the air purifier 24 hours a day at this setting would cost approximately $0.12 per day based on average U.S. electricity rates.
A: Alen offers a one-year factory warranty and a lifetime warranty for its BreatheSmart 45i air purifier. The lifetime warranty is transferable and requires product registration and enrollment in a filter subscription program within 12 months of purchase. Compared to other air purifier brands, Alen's warranty stands out for its lifetime coverage and transferability, providing long-term protection and peace of mind to consumers.
A: Yes, you can control the BreatheSmart 45i remotely using the Alen Air app. The app allows you to view real-time air quality, see historical trends, control your purifiers remotely, set air quality notifications, and get reminders when it's time to replace your filter.
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

The Alen BreatheSmart 45i is ideal for bedrooms and other rooms up to 800 sq. ft. Proven to improve sleep by and independent SleepScore Labs study, the BreatheSmart 45i emits a soothing pink noise that boosts frequencies in the lower octaves, so you wake up feeling rested. Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration technology to deliver and maximize airflow while minimizing noise. Our medical-grade filters capture particles as small as 0.1 micron, removing even the tiniest pollutants including dust, pollen, pet dander, mold spores, germs and bacteria, and more. Laser sensor technology detects when particles are present and auto-adjusts fan speed, so you don’t have to. The 5 color coded rings show your indoor air quality at a glance and let you see how Alen is working to clean the air quickly and efficiently. Get real time air quality insights, view historical trends, or control your purifier remotely using the Alen Air app. Alen air purifiers are backed by the industry’s only Forever Guarantee.

The Shark NeverChange Air Purifier MAX is designed for 10x longer filter life, saving you $300 or more in filter replacement costs over 5 years*. It captures 99.98% of airborne particles like allergens*, dust, and dander (based on IEST-RP-CC007.3, 0.1-0.2 microns). It covers up to 1400 sq. ft. for powerful, multi-room purification. Odor Neutralizer Technology guards against odors throughout your home, releasing a fresh scent into your air for 2x better odor reduction vs. filtration alone, Based on ASTM E544 vs. HP300 with filter and carbon only, after 30 minutes. *Allergen refers to non-living matter. *Vs. cost of replacing filters on a competitor unit over 5-year period in 300 square foot space.

Small and mighty purification that’s perfect for small bedrooms, nurseries, home offices, and laundry rooms. It circulates the air in 285 sq. ft. 4x/hour or in 570 sq. ft. 2x/hour.

This Honeywell Air Genius 5 Air Purifier features 5 levels of cleaning power and patented ifD technology to capture up to 99.9% of microscopic airborne particles*1 ( 1 From the air that passes through the filter, 0.3 microns and larger. 2 Based on 3rd party independent CADR testing for the smoke CADR value when operated at the highest level. Air circulation depends on many factors, such as room size and configuration. There is no guarantee that all of the air in a room will pass through the filter. 3 The ifD particle filter and foam pre-filer can be washed to clean. 4 When operated with the odor reducing pre-filter. It is recommended that the pre-filter be replaced every 3 months to effectively reduce common household odors and VOCs in a room).
| Pros for Alen - BreatheSmart 45i 800 SqFt Air Purifier with Fresh HEPA Filter for Allergens, Dust, Odors & Smoke - White | |||
|---|---|---|---|
| There were no pros for this product— | Air Quality, Noise Level, Overall Performance, Filter Life, Odor Removal | There were no pros for this product— | There were no pros for this product— |
| Cons for Alen - BreatheSmart 45i 800 SqFt Air Purifier with Fresh HEPA Filter for Allergens, Dust, Odors & Smoke - White | |||
| There were no cons for this product— | Size, Fan Speed | There were no cons for this product— | There were no cons for this product— |