Powerful filtration for medium spaces

HEPASilent™ technology captures 99.97% of airborne particles

Eliminate odors

OdorFence™ Technology delivers 10x more odor removal for truly fresh, clean air

4.5

Rated 4.5 out of 5 stars

4.5 Stars (320 Reviews)

Blue Signature™ Medium

Name: Blue Signature™ Medium Midnight
Brand: Blueair
Price: 299.99 USD
Availability: InStock
Rating: 4.5 (320 reviews)

HEPASilent™ air purifier that cleans 498 ft² every 12.5 minutes and delivers 10x more odor removal with OdorFence Technology

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Designed for

Living rooms, bedrooms, offices

Great for

Odors, allergens, pets

Size: Medium

Color: Midnight

One Time Shipment

1 Air Purifier
1 Particle & Carbon Filter
1 Pre-Filter

1 Replacement Filter
Save 15% on every filter
Pay when we send it

Select Filter Type

Save 15% on every filter

Free & fast shipping
30 day home trial
Free extended warranty

Why you’ll love it

The most powerful, compact air purifier you can get. Your all-in-one solution for cleaner air, fresher rooms, and total everyday well-being.

Quickly cleans 498 ft² every 12.5 minutes & 2,250 ft² in 1 hour
Helps clear stubborn odors across the whole room
Keeps up with changing air quality automatically
Customizable design lets you make it your own

Accessories designed to fit your style
Motion activated touchscreen display
Accurate filter lifetime tracking
Doubles as a table-top

Features & Technologies

HEPASilent™ filtration captures 99.97% of tiny airborne particles
OdorFence Technology™ provides powerful odor removal
Smart VOC sensing detects gases and chemical pollutants
Auto Mode adjusts fan speed based on your air quality
Night Mode keeps cleaning quieter while you sleep
Eco Mode saves energy when air quality is good
Motion activated controls appear when you need them
RealTrack Technology® accurately tracks filter lifetime
Wi-Fi connectivity gives you easy app control

What’s in the box

Additional Features

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
Number Of Filters 1

Pre-Filter|Nordic Fog

$22.99

Pre-Filter

Wood Leg Base

$69.99

Chrome Ring Base

$89.99

Powerful filtration for medium spaces

HEPASilent™ technology captures 99.97% of airborne particles

Eliminate odors

OdorFence™ Technology delivers 10x more odor removal for truly fresh, clean air

Why choose Blue Signature™?

Doubles as a table-top & much more

Make it yours. Choose from curated pre-filter colors and accessories that elevate your space.
Dynamically displays your air quality

See your air quality at a glance. The motion-activated display responds to your preferences in real time.

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

Effortlessly take control of your air

Select a fan speed, let auto or night mode take over & keep settings secure with display lock.
Customize schedules to fit your lifestyle

Set your preferred times for enhanced air purification, so you can wake up to fresh air, keep your home clean during peak hours, and save energy when you're away.
Smart filter lifetime tracking

Tracks the filter lifetime based on pollutant levels and alerts you when it’s time to replace your filter.

Feel the difference with Blue Signature™

95%

felt it contributed to a
healthier living environment⁵

89%

prefer it over any
other air purifier⁵

<p>Feel the difference with Blue Signature™</p>

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

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
Clean air delivery rate (CADR)

Pollen 330
Dust 309
Smoke 321
Number of filters

1
Speed control options

1 - 2 - 3 - 4 - Auto - Night

FAQ

What is the warranty for Blue Signature™?

How often do I need to change the filter?

Your filter will last up to 1 year thanks to our unique patent-pending design & proprietary RealTrack algorithm that accurately calculates the remaining filter lifetime based on fan speed, usage time and pollution levels.

When it's time to replace the filter, the filter replacement LED on the interface will turn red to remind you. Alternatively, connect to the Blueair app to receive an alert and easily re-order at the touch of a button.

What room size is best?

What are the noise levels?

4.5

Rated 4.5 out of 5 stars

Based on 320 reviews

85%would recommend these products

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320 reviews

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BW
Brian W.
Verified Buyer
18 hours ago
Reviewing
Blue Signature™ Large Nordic Fog
Rated 5 out of 5 stars
Good purifier
Very quiet, and nice, and strong,
Was this helpful?
JP
JONATHAN P.
Verified Buyer
6 days ago
Reviewing
Blue Signature™ Large Nordic Fog
Rated 5 out of 5 stars
Amazing
Within 24 hours my house smelled fresh and crisp. Works great, especially if you have pets!
Was this helpful?
DP
David P.
Verified Buyer
1 week ago
Reviewing
Blue Signature™ Small Midnight
Rated 5 out of 5 stars
good
very good
Was this helpful?
ET
Elizabeth T.
Verified Buyer
1 week ago
Reviewing
Blue Signature™ Large Midnight
Rated 5 out of 5 stars
Blue Signature large
I own four of the large Blue signature
Air purifiers and also
The Blue Pure 311i
Max changed our lives. We breath better, feel better the
air through out the
home is fresh clean
air. We love them.
Was this helpful?
DW
Deana W.
Verified Buyer
1 week ago
Reviewing
Blue Signature™ Small Nordic Fog
Rated 5 out of 5 stars
Small but mighty!
I couldn’t be more happy with my Blue air purifiers. Noticeable improvement in my overall quality of life, breathing is not longer a struggle.
Most importantly my migraines have lessened.
Being able to utilize my Hsa/Fsa funds made this possible. Happy customer!
Was this helpful?

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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+

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