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Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
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Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
Blue Signature™ Medium Midnight
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Blue Signature™ Medium

Air Purifier, Medium Rooms

4.6
Rated 4.6 out of 5 stars
4.6 Stars (230 Reviews)
Save 20%
Size: Medium
One Time Shipment
  • 1 Air Purifier
  • 1 Particle & Carbon Filter
  • 1 Pre-Filter
Filter Subscription
  • 1 Replacement Filter
  • Save 15% on every filter
  • Pay when we send it
Customize Your Subscription
Select Filter
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  • Most Popular

  • Rapidly cleans 498 ft² in 12.5 minutes & up to 2,250 ft² in 1 hour
  • Smart VOC sensor detects what you can’t see, so you can breathe better
  • 7 stages of filtration removes 99.97% of airborne particles
  • 10x³ more odor removal with OdorFence Technology
  • Dynamic display that auto-adapts to enhance your air
  • Double the filter lifetime thanks to our patent-pending filter design
  • Smart features in the highly rated, newly improved Blueair app
  • Customize with exclusive accessories
  • Motion activated touchscreen display
  • RealTrack Technology®
  • Doubles as a table-top

Why choose Blue Signature™?

7 stages of superior filtration and smart VOC sensing for 10x³ more odor removal

Smart VOC sensing continuously detects airborne gases and chemical pollutants in real time. HEPASilent filtration technology captures at least 99.97% of tiny airborne pollutants down to 0.1 microns, such as fine particles, dust mite allergen, pollen, bacteria, virus and mold allergen⁴

OdorFence captures common odor gases and breaks them down. It’s deep, effortless clean air you can feel, and smell, every day.

“I tested it with kitchen odors while cooking, and within about 20 minutes of running the air purifier, I could smell little to nothing. I find that astonishing. I've used other air purifiers before, but this one does the trick.”

Jake

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Feel the difference with Blue Signature™

95%

felt it contributed to a
healthier living environment⁵

89%

prefer it over any
other air purifier⁵

Feel the difference with Blue Signature™

Proud to be a Certified B Corp

As a B Corp, we’re part of a global community of businesses that meet high standards of social and environmental impact.

  • Free & fast shipping

  • 30 day home trial

  • Extended warranty

Blue Signature™ Medium Midnight

Technical Specifications

  • Dimensions(HxWxD)

    19.3” x 11.7” x 11.7”

  • Product Weight

    9.5 lbs

  • Energy Consumption

    36 W

  • Sound level

    Low setting: 19 dB High setting: 54 dB

  • Air outlet

    Side

  • Recommended room size

    498 ft2

  • Air changes per hour (ACH)

    4.8

  • Number of filters

    1

  • Speed control options

    1 - 2 - 3 - 4 - Auto - Night

FAQ

Register your product to extend the 1-year warranty to a 3-year warranty.

4.6
Rated 4.6 out of 5 stars
Based on 230 reviews
Total 5 star reviews: 190 Total 4 star reviews: 16 Total 3 star reviews: 14 Total 2 star reviews: 3 Total 1 star reviews: 7
90%would recommend these products
230 reviews
  • PM
    Patrcik M.
    Verified Buyer
    4 hours ago
    Reviewing
    Blue Signature™ Large Nordic Fog
    Rated 5 out of 5 stars
    Review

    Very quiet and very effective. The analysis of air quality on the app is excellent.

  • SS
    Susan S.
    Verified Buyer
    6 hours ago
    Reviewing
    Blue Signature™ Medium Midnight
    Rated 5 out of 5 stars
    Works well

    I bought this for an open space area in an apartment. I’ve enjoyed having it, especially when cooking with strong odors or the room gets smoky. It was a little tricky connecting to my WiFi, but glad I did. I set it on auto most days. Now when I start to cook certain things, I turn the fan to 4 for extra circulation before getting started. Overall, it’s quiet and helpful.

  • LD
    Leslie D.
    Verified Buyer
    2 days ago
    Reviewing
    Blue Signature™ Large Nordic Fog
    Rated 5 out of 5 stars
    Love my Blueair collection

    So quiet & so effective, plus it looks nice :)

    Ps. I have 5 models, one for every room ❤️

  • EM
    Emily M.
    Verified Buyer
    1 week ago
    Reviewing
    Blue Signature™ Large Nordic Fog
    Rated 5 out of 5 stars
    Love it!

    Exactly what I wanted. Works wonderfully and looks snazzy.

  • PM
    PAUL M.
    Verified Buyer
    1 week ago
    Reviewing
    Blue Signature™ Large Nordic Fog
    Rated 5 out of 5 stars
    Works great

    We’ve been using the Blue Signature™ Large humidifier in our 3-month-old daughter’s room, and it’s made a noticeable difference. The air feels more comfortable, especially at night, and it’s helped keep the room from getting too dry.

    It’s very easy to use—setup was simple, and the controls are straightforward. It runs quietly, which is perfect for a nursery and doesn’t disturb her sleep.

    Since using it, we’ve noticed the room feels more balanced and comfortable overall, which gives us peace of mind for our baby. Definitely a great addition for anyone with a young child or dealing with dry air.

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¹Based on high-speed CADR by volume vs. similar competitive models

²Tested on PM2.5 up to 90 minutes.

³Tested on Acetaldehyde gas vs. similar leading competitor filter

⁴Based on consumer testing of 38 users over the course of 4 weeks

⁵Compared to Blue Pure 211+