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
Up to 5x
Indoor air pollutant levels can be 2 to 5 times higher than outdoor levels.
Asthma & Allergy Friendly
Certified
Achieved Energy Star's 2025 'Most Efficient'
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.
airID uses AI-powered optical technology to detect, identify, and measure air particles so you can track pollutants like dander, smoke, pollen, and smog.
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 45i
Designed for spacious comfort, the 45i purifies up to 1,900 sq ft every hour or 950 sq ft every 30 minutes, keeping your main suite pure and serene.
Ideal for high-traffic zones, the 45i purifies up to 1,900 sq ft every hour or 950 sq ft every 30 minutes, ensuring your living area stays clean and welcoming.
Adapting to changing conditions, the 45i purifies up to 1,900 sq ft every hour or 950 sq ft every 30 minutes, maintaining a fun and healthy environment for everyone in your family room.
Picture the perfect spot for your
BreatheSmart 45i
Designed for spacious comfort, the 45i purifies up to 1,900 sq ft every hour or 950 sq ft every 30 minutes, keeping your main suite pure and serene.
Ideal for high-traffic zones, the 45i purifies up to 1,900 sq ft every hour or 950 sq ft every 30 minutes, ensuring your living area stays clean and welcoming.
Adapting to changing conditions, the 45i purifies up to 1,900 sq ft every hour or 950 sq ft every 30 minutes, maintaining a fun and healthy environment for everyone in your family room.
What makes the BreatheSmart 45i different from other air purifiers?
The Alen BreatheSmart 45i combines advanced HEPA filtration technology with optimized airflow for maximum efficiency and minimal noise. This allows for whisper-quiet removal of particulate matter, even on the highest setting, 24/7.
What is included with the BreatheSmart 45i purchase?
The BreatheSmart 45i package includes the air purifier unit, a pre-installed filter, and a user manual. Additional filters can be purchased separately.
Does the BreatheSmart 45i come with a warranty?
Yes, the 45i comes with Alen's Forever Guarantee. This lifetime warranty covers any manufacturing defects when you maintain an active filter subscription service. If your purifier ever has issues, Alen will fix or replace it for free.
How can I trust the Alen brand?
We are committed to transparency and customer satisfaction. You can find over 5,000 reviews on our website and third-party platforms that attest to the quality and reliability of our products.
How does the 45i compare to other brands?
The BreatheSmart 45i offers superior performance with advanced HEPA filtration, quieter operation, and the Forever Guarantee, which many competitors do not offer.
How large of an area can the BreatheSmart 45i cover?
The BreatheSmart 45i is designed to purify spaces up to 1,600 sq ft, making it ideal for living rooms, open-concept spaces, and medium rooms.
How does the BreatheSmart 45i improve sleep quality?
The 45i is engineered to emit a soothing pink noise, which promotes better sleep by masking disruptive sounds. It has been shown to improve sleep quality in a peer-reviewed study by SleepScore Labs.
What types of filters are available for the 45i?
The BreatheSmart 45i has four filter options: Pure (for allergens), Fresh (for chemical odors), Odor (for smoke and pet odors), and VOC/Smoke (for tough odors). All filters are interchangeable, so you can switch based on your needs.
What are the noise levels of the BreatheSmart 45i?
The 45i operates at whisper-quiet levels, even on the highest fan setting. The pink noise it generates is calming and helps create a peaceful environment.
Can I control the 45i remotely?
Yes, the 45i can be controlled remotely using the Alen Air app. You can monitor air quality and adjust settings from anywhere.
What’s included with my purchase of the BreatheSmart 45i?
The 45i comes with the air purifier unit, one pre-installed filter, and a user manual. Additional filters can be purchased separately. The app is available for Apple iPhones and Android.
How energy-efficient is the BreatheSmart 45i?
The 45i is designed to be energy efficient, consuming minimal electricity while maintaining high purification performance.
Can I leave the 45i running all the time?
Yes, the BreatheSmart 45i is designed for continuous operation. Running it 24/7 ensures optimal air quality in your space.
Does the 45i help with wildfire smoke?
Absolutely. The 45i with a VOC/Smoke filter captures fine smoke particles, making it ideal for areas affected by wildfires.
What is the power consumption of the BreatheSmart 45i?
The 45i consumes 50 watts on the highest setting, which is energy efficient given its high air purification power. It’s designed for continuous operation.
Does the BreatheSmart 45i help reduce odors and smoke?
Yes, with the Odor and VOC/Smoke filters, the 45i effectively removes odors from cooking, pets, and smoke. These filters neutralize airborne particles that cause unpleasant smells.
How does the BreatheSmart 45i help with allergies?
The 45i's HEPA filtration captures 99.99% of airborne particles down to 0.1 microns, effectively removing allergens like dust, pollen, and pet dander.
How often should I replace the filter?
Alen recommends replacing filters every 9-12 months, depending on usage and environmental factors. The Alen Air app can remind you when it’s time for a change.
Is the 45i safe for use around pets and children?
Yes, the 45i is safe for use around pets and children. Its design includes safety features like a child lock, and its quiet operation ensures it won't disturb your pets or sleeping children.
What does the red light around the power button mean?
The red light indicates poor air quality, as detected by the 45i's air quality sensor. It automatically adjusts fan speed to clean the air faster.
