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.
The BreatheSmart 45i air purifier is highly recommended by users for its sleek design, quiet operation, and noticeable improvement in air quality. Customers appreciate its easy setup, effective filtration, and the overall positive impact on their sleep quality.
"Customer service is fantastic, the unit looks great, it’s impressively quiet, and the air is clean!" — Eliza L.
"Unit arrived very quickly and the oak front panel looks great with our decor." — Diane C.
"It is very quiet running in the lowest setting at night and has a very sleek and modern design." — Willy S.
Reviews
I'm so glad I bought the Breathesmart Ultimate45i
"I had a Shark Neverchange Air Purifier for years and while it is good for particulates and pet hair, it was no good for cooking and pet odors. After only a few days of running the 45i with Ultimate Filters on each floor, my bedroom no longer smells like the kitchen. I'm impressed with how well they do their job."
— KristenTris (5/5)
"This is an outstanding product. It has helped my allergies so much. It is a pleasure to not have to blow my nose every two minutes. I love the adjustable feature that it just automatically adjust to the environment to keep us healthier and safer. I cannot say enough about this wonderful machine and the great customer service I received."
— Faith (5/5)
"We’ve been using it for three days now and it is made a significant difference in the home. My allergies were really bothering me and my nose has stopped running. It is almost miraculous. I love how quietly runs. We leave it on automatic. It is impressive that when we are cooking something either in the air fryer or cooking on a gas stove that the air purifier adjust itself and creates a safer home environment for humans and our animals. I cannot say enough about this beautiful machine and the Customer Service that I’ve received."
— Faith (5/5)
After one year, I’m so glad I made this purchase!
"Love the indicators to tell how the air is doing and getting cleaned and the prof is in the picture I’m attaching- the dust was caked on! Couldn’t wait to change the filter . Peace of mind with clean air is a worthy investment ."
— Sara T. (5/5)
"Everything in my house… Paint fumes… Smoke… Sawdust… It all shows up as dander. I don’t believe this machine is smart enough to tell me the issues. It did not detect high levels of pollen in my house when I was sneezing. I’m not impressed and quite disappointed."
— Tina (1/5)
"Very happy with my purchase. Love that the air purifier turns colors to let you know the air quality. Would definitely recommend to my friemds."
— Dawn (5/5)
A breath of cleaner air!
"I’ve gone through my share of air purifiers, but the Alen 45i is the first one I don’t feel the need to hide behind a couch. It’s sleek, matches my decor perfectly, and is incredibly quiet. I love the color-coded ring—it’s a quick peace of mind to see that blue light and know the air is clean. Definitely worth the investment for the silence alone!"
— Jason (5/5)
Great product!
"I have allergies and since getting these in my home I've noticed a decrease in allergie symptoms and my house is not near as dusty."
— Jason (5/5)
A Top Tier Air Purifier
"We got this for our work office because the building is OLD like historic. We also chose the odor filter. Our concerns for our staff were mold, dust, and the scent of an old building. We didn't want to just cover up the smell with another scent we wanted to get to the root of it. The sleek design blends into the office space. It is also super quite!!"
— Ken J. (5/5)
"Nice and quiet"
— Kimberly (5/5)
Q&A
I’m having trouble deciding color. Are the faceplates interchangeable if I move or redecorate?
If you decide you want a different panel design for your unit at a later date, you can purchase a new panel with the design of your choice for your model purifier and it will snap on just like your current one does
Can it handle living room and open kitchen with a main bedroom. Around 1900 sq ft?
If there are walls that separate the bedroom then that area would not get the benefit of the air purifier and would recommend a 35i or 25i for the bedroom in addition to the 45i
Do your air purifiers use only mechanical filtration and no electrostatic or ionization methods? Is there any ozone produced? Are you CARB certified.
All units use mechanical filtration, no electrostatic. Our 45i and 75i have an ionizer feature that you can turn on or off, with less than 0.001PPM ozone when engaged
FAQs
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.
