Air purifiers

Blueair Classic 405

Blueair Classic 405

Best forFamilies looking for an easy-to-use, effective and efficient air purifier for a medium-sized room

Top BenefitsQuiet at lower speeds, app connection, child lock

ConsiderationsMaximum fan setting is quite loud, not ideal as a portable unit

Bottom lineThe Blueair Classic 405 is very simple and straightforward air purifier, with three fan speeds and a night mode. Plus, it connects to the Blueair Friend app via Wi-Fi for easy adjustment or to turn the unit on or off from anywhere. With its HEPASilent filter, it removes particles as small as 0.1 microns from the air.

Buy CAD $599.98
blueair.comUSD $549.99


  • Connects to the Blueair Friend app to turn the unit on or off, adjust the fan speed and adjust the brightness of LED lights
  • Child safety lock (activated in the app) to prevent kids from changing settings on the unit
  • Night mode allows you to activate or deactivate settings at specific times
  • Filter change indicator on the unit eliminates guesswork


The air inside our homes can be two to five times more polluted than the air outside, and given how much time we spend indoors, ensuring the air is clear and free of allergens and irritants is important for good health. We put a range of air purifiers to the test to determine which ones were up to the task, and the Blueair Classic 405 hit all the right marks in our tests and with parents who tried it out at home thanks to its quiet and easy operation and handy app. 

Designed for mid-size rooms, the Blueair Classic 405 uses “HEPASilent” technology—a combination of electrostatic charges and three-stage HEPA filtration—to capture up to 99.97 percent of airborne particles such as dust, animal dander, pollen, cigarette smoke and viruses, as small as 0.1 microns. To test its effectiveness, we placed the unit in an air-tight 8- x 8- x 4-foot space along with an ultra-fine particle counter and then sprayed dry shampoo into the space for five seconds. This air purifier made quick work of cleaning the air, bringing the particulate levels down to under 100 particles per cubic centimetre (well below what’s considered clean air) in less than five minutes. Editors also looked at the clean air delivery rates (CADR), a score that indicates how quickly a device filters the air; this independent testing is carried out through the Association of Home Appliance Manufacturers. According to the CADR scores, the Blueair Classic 405 does an excellent job of filtering the three particulates tested (tobacco smoke, dust and pollen) in rooms up to 434 square feet. In fact, it has some of the highest CADR scores of any of the air purifiers we tested.

I'm pretty in love with this air purifier. We can go to bed at night without smelling the cat litter from the other room. And I've noticed that I'm breathing a lot better when I wake up in the morning—previously I'd been waking up very stuffed up and congested." —Laurie, mom of one

Parents who tested the air purifier at home had it running in high-traffic living spaces, including a main living room and basement. Though the Blueair Classic 405 doesn’t come with a built-in air-quality sensor (you can buy the compatible Blueair Aware Indoor Air Quality Monitor separately), our testers found using the machine on the medium or lowest settings still made a difference in their air quality, removing odours, reducing dust and alleviating allergy symptoms. They also loved the ease and convenience of the Blueair Friend app, which allowed them to control the fan speed or turn the unit off, even if they weren’t home.

Parent testers were especially impressed with how easy it is to set up and use the Blueair Classic 405, including connecting the air purifier to the Blueair Friend app. Instructions are clear, and the control panel on the air purifier is intuitive, with icons for fan speed (three illuminated bars representing low, medium or high), Wi-Fi connectivity and change filter reminder. But the app is where the functionality really shines: It adds the ability to activate night mode and a child lock so settings can't be changed by them, plus you can control the air purifier from anywhere. Replacing the filter—which Blueair recommends changing every six months—is also very straightforward: you simply open the door on the back and it slides right out. You'll need to vacuum the inside of the unit before replacing the filter, but it's a quick and simple task. 

I love it. The set-up was incredibly easy; it basically just needed to be plugged in and connected to the app. The app allows me to turn it on or off, and change the fan speed anywhere at anytime. And the controls on the panel are very simple, straightforward and easy to use." —Carol, mom of one

Noise is always a consideration for parents (the last thing you want is an air purifier that wakes a sleeping baby), and the Classic 405 is quite quiet. All of our parent testers said the Blueair Classic 405 was either silent or very quiet on low and medium fan speeds. There is a big jump in volume between medium and high, but that's pretty typical of air purifiers, and you're really only going to crank it up to high when you know there's something in the air and you want to clear it fast. That said, to change the fan speed on this unit you can only cycle up, which means you'll very briefly activate the high fan speed when you want to change it from medium to low—something to think about if you plan to place the air purifier in or near a child’s room.


The Blueair Classic 405 air purifier is a great option for families. All parent testers gave it a very good rating for ease of use, and two out of three also rated the quality very good (the other tester gave it a good rating). This wasn't surprising given how impressed they were with its effectiveness, the easy-to-use app and even the child lock that meant their littles couldn’t mess with the settings on the control panel. Plus, they felt it offered good value at its price point. Editors similarly appreciated the simplicity and effectiveness of this air purifier. It gets the job done well, quickly and easily, and that's really what you want.

It's a high-quality, hard-working machine that takes up minimal space and is very easy to set up and to program, especially with the app. I'd recommend it to other families, especially if they have allergies or live in a dusty place." — Arieke, mom of two

Tech Specs

    Suitable for medium rooms, up to 434 sq. ft.
    Removes 99.97% of particles as small as 0.1 microns
    HEPASilent technology combines electrostatic and mechanical filtration
    400 Series Smoke Stop Filter includes an active carbon filter to trap gasses, such as VOCs
    Night mode allows you to activate or deactivate certain settings at specific times
    3 speed settings
  • SIZE
    23 in. x 20 in. x 11 in.
This article was originally published on Oct 17, 2018

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