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Indoor air pollutant levels can be 2 to 5 times higher than outdoor levels.
Achieved Energy Star's 2025 'Most Efficient'
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.
Overall rating: 4.8526764 / 5 from 1887 reviews.
Customers appreciate the BreatheSmart 45i air purifier for its effective air cleaning, quiet operation, and sleek design. The product is praised for its high-quality performance and ease of setup, making it a valuable addition to any home.
Review topics: ["size","installation","colors","cat","weight","instructions","fit","smell","support","sound","feel","allergies","performance","assembly","quality","problem","replacement","maintenance","shipping","motor","husband","results","warranty","directions","design","cover","looks","filter","construction","customer service"].
"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."
"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."
"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."
"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 ."
"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."
"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."
"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!"
"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."
"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!!"
"Nice and quiet"
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