Classic 405

Classic 405
Would you like a filter subscription?
Get fresh filters delivered to your door, when you need them

Notify me when available
Receive email notification when item is back in stock

Please note: by submitting your email you are agreeing to Blueair's Terms of Use and Privacy Policy


The Blueair Classic 203 Slim takes up so little space, yet it delivers solid clean-air performance. A great choice for smaller-sized rooms where you and your loved ones want to breathe easy.

Optimal air for medium spaces

Filters the air in a 240 ft² space in about 12.5 min¹ (4.8x an hour, based on AHAM recommended removal rate) to effectively lower particle levels and maintain a comfortable environment in medium spaces like master bedrooms, living rooms, and playrooms.

Blueair Classic 203
Blueair View of Classic unit from side with 5 Year WArranty graphic overlaid
Allergen & germ removal

Comes standard with a particle filter to remove airborne allergy and asthma triggers like pollen, dust, pet dander, mold, smoke and more.

Blueair Child sleeping in bed
Sound design you can sleep on

Get clean air while you sleep without noise disruption. Quiet Mark approved for operating at a whisper quiet 32 dB on its lowest speed, and no louder than the 52 dB white noise of a floor fan on its highest speed.

Blueair Classic 605 placed in bedroom near wall - child laying on bed playing with tablet
Wi-Fi enabled

The Classic 405 air purifier allows you to take full control of your indoor air quality with intelligent smartphone control and Alexa compatibility. 

Independently proven performance
Blueair Image
Verifide(R) for performance and Clean Air Delivery Rate (CADR).
Blueair CARB logo
Certified to meet ozone safety standards.
Blueair Energy star logo
Rated as energy-efficient air purifiers.
  • Wi-Fi connectivity for remote control
  • On/off timer
    Yes (via Blueair Friend App)
  • Filter replacement indicator
  • Speed control options
    1 - 2 - 3
  • Wheels
Included in the box

Items packaged individually within box - please read manual for set-up instructions.

Blueair Classic 405 air purifier on transparent background
Classic 405 air purifier
Blueair IN the box - Instruction manual 211+ auto
Instruction manual
  • Dimensions(HxWxD)
    23 x 20 x 11 in (590 x 500 x 275 mm) in
  • Product weight
  • Energy consumption
    15 - 90 W
  • Sound level
    32 - 52 dB(A)
  • Air outlet
  • Air inlet
  • Recommended room size
    434 ft2
  • Air changes per hour (ACH)
  • Clean air delivery rate (CADR) - Pollen
    300 cfm (510 m³/h)
  • Clean air delivery rate (CADR) - Dust
    300 cfm (510 m³/h)
  • Clean air delivery rate (CADR) - Smoke
    280 cfm (476 m³/h)

Guarantee clean air for years to come with up to 5-years of warranty coverage when you register your air purifier.

How does this model differ from the Classic 480i?

The 480i model comes with a built-in sensors for particles (PM2.5), and gases/Volatile Organic Compounds (VOC), temperature and humidity, as well as the AUTO mode setting.

I've replaced my filters, now how do I reset the filter replacement indicator?​

Press and hold down the orange filter status LED for 10 seconds to reset the replacement filter indicator. ​​

I'm having Wi-Fi connectivity issues, what can I do to troubleshoot?

First, make sure your Wi-Fi network is connected to the internet, and check that your network name and password are correct. You can also try unglugging the cord from the electrical outlet and plug it back in again.