Why choose Blue Signature™?
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Doubles as a table-top & much more
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Dynamically displays your air quality
“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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Effortlessly take control of your air
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Customize schedules to fit your lifestyle
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Smart filter lifetime tracking
Feel the difference with Blue Signature™
95%
felt it contributed to a
healthier living environment⁵
89%
prefer it over any
other air purifier⁵
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Free & fast shipping
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30 day home trial
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Extended warranty
Technical Specifications
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Dimensions(HxWxD)
19.3” x 11.7” x 11.7”
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Product Weight
9.5 lbs
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Energy Consumption
36 W
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Sound level
Low setting: 19 dB High setting: 54 dB
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Air outlet
Side
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Recommended room size
498 ft2
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Air changes per hour (ACH)
4.8
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Clean air delivery rate (CADR)
Pollen 330
Dust 309
Smoke 321
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Number of filters
1
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Speed control options
1 - 2 - 3 - 4 - Auto - Night
FAQ
- WSWilliam S.Verified Buyer6 hours agoReviewingBlue Signature™ Small Nordic FogRated 5 out of 5 starsSignature Series is Amazing
I have had several different models, and this one by far beats all of those—love it!
- TPThomas P.Verified ReviewerYesterdayReviewingBlue Signature™ Medium Nordic FogRated 5 out of 5 starsExcellent Air Purifier
I purchases two SPI3's for my computer room to replace an Alen 45I and a Winix T830. The SPI3's have substantially higher CADR performance than either of those units. They also measure VOCs as well as PM2.5 which neither of those two units do. The filter is also technologically advanced being a 7 stage HEPAsilent filter filtering down to .1 microns and having the ability to filter out VOCs. I also like that the prefilter is removable and washable. I purchased two additional prefilters so that I can swap the prefilters when the used filters are being washed so I am not down as the filters are drying. I also purchased the wooden base to elevate the filters and add a custom look to the filters. Blueair, simply put, makes the best air purifiers on the market today having won various best-in-class awards for their products. I've already recommended the product to other members and friends of my family.
- HOH O.Verified Buyer2 days agoReviewingBlue Signature™ Medium Nordic FogRated 5 out of 5 starsAwesome Machine
Arrived one week before the smoke from the forest fires in the north came to the city. Woke up to orange skies and were at good/ excellent air quality while many of our neighbors had to use multiple air purifiers to stay safe or come over because they did not have any type of air purifier. The Blueair signature is quiet and efficient. Really appreciate the app for monitoring as well.
- KRKeri R.Verified Reviewer2 days agoReviewingBlue Signature™ Medium Nordic FogRated 5 out of 5 starsBlue Signature Medium with 4 Leg Base- Best Air Purifier I've seen yet!
The Blueair Blue Signature Medium Nordic Fog is the best air purifier I've come across so far.
In particular, it has a large, effective filter, a sensor for both particles and VOCs, a great on-unit display system that only lights up when you move nearby, an excellent phone app for remote monitoring, control and scheduling... and my favorite : an effective yet extremely quiet fan!
My primary concern is noise level and noise character and the Blue Signature Medium is by far the best I've seen or heard. At the highest speed, the noise character is not obtrusive and it becomes much less so as it slows down to the usual Low speed. Low speed is very quiet and the sound is unobtrusive., so that even I can easily sleep near it in a quiet room. But it gets even better with Night mode, which can be set in schedule. where it becomes almost silent. The fan blade design is unique, being in between a blade fan and a squirrel cage blower.
The Blue Signature Medium has been performing brilliantly during the recent wildfire smoke, which is imperceptible indoors but quite obnoxious outdoors.
For me, the optional wooden leg stand is a must as it raises the Blue Signature Medium off of the floor and to a more pleasing height. As it just rests atop the stand, any small stool would suffice.
In comparison to other Blueair products I've experienced:
The DustMagnet 5410, while competent, lacks the VOC sensor and while reasonably quiet, the squirrel cage blower design is nowhere near…
BBlueair14 hours agoThank you for sharing such a detailed, well-thought-out review! Your comparison of the Blue Signature Medium against the rest of the lineup—including the DustMagnet 5410 and the Protect 7710i—is spot-on and incredibly perceptive. Enjoy the clean air and quiet nights with your Signature unit!
- JHJames H.Verified Buyer3 days agoReviewingBlue Signature™ Medium Nordic FogRated 5 out of 5 starsBlueair review
Did a great job of removing Canadian smoke from the air.
