“Better air helps me sleep, recover, and show up at my best–whether I'm stepping onto the court or spending time with my family. That's why I'm excited to partner with Blueair.”
Josh Hart, NBA NY Knicks Guard & Blueair Ambassador
“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.”
Feel the difference with Blue Signature™
95%
felt it contributed to a
healthier living environment⁵
89%
prefer it over any
other air purifier⁵
Technical Specifications
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Dimensions(HxWxD)
13.7” x 9.4” x 9.4”
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Product Weight
5.64 lbs
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Energy Consumption
20 W Max
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Sound level
Low setting: 19 dB High setting: 50 dB
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Recommended room size
248 ft²
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Air changes per hour (ACH)
4.8
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Clean air delivery rate (CADR)
Pollen 179 cfm
Dust 167 cfm
Smoke 160 cfm
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Number of filters
1
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Speed control options
1 - 2 - 3 - 4 - Auto - Night - Eco
FAQ
Total 5 star reviews: 216
Total 4 star reviews: 17
Total 3 star reviews: 16
Total 2 star reviews: 5
Total 1 star reviews: 12
88%would recommend these products
266 reviews
- SCSharon C.Verified Buyer3 minutes agoReviewingBlue Signature™ Large Nordic FogRated 5 out of 5 starsLove it!
Our neighbor burn wood next-door and it caused our house to smell like smoke really bad. The blue air purifier light turned red and noticed the air quality indoors was bad. Within an hour, the air quality was good again and we could breathe once more. We love it so much, we are thinking about getting one for the bedroom as well.
- WSWilliam S.Verified Buyer2 days 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 Reviewer3 days agoReviewingBlue 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 Buyer3 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 Reviewer4 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…
BBlueair2 days 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!
