Fresh air you can feel and smell

7 stages of filtration capture tiny airborne pollutants while OdorFence™ Technology helps break down common odors.

Easy to replace. Easy to remember.

Simple filter changes and RealTrack™ monitoring take the guesswork out of keeping your purifier performing its best.

4.4

Rated 4.4 out of 5 stars

4.4 Stars (45 Reviews)

Blue Signature™ Large Replacement Filter

Keep Blue Signature™ performing at its best with long-lasting 7-stage filtration designed to tackle particles, allergens & household odors.

Designed for

Blue Signature™ Large

Great for

Everyday clean air, allergy season, smoky days

Size: Large

Filter Subscription

1 Replacement Filter
Delivered Every 12 Months
Pay when we send it
Save 15% on recurring filter replacements

Most Popular

Free & fast shipping
30 day home trial
Free extended warranty

Why you’ll love it

Long-lasting filtration that keeps clean air simple and takes the guesswork out of replacement.

Helps capture dust, pollen & pet dander
Tackles everyday household odors
Lasts longer for fewer filter changes
Tracks filter life based on how you actually use your purifier
Alerts you when it’s time for a replacement
Designed for a quick, hassle-free swap

Up to 1-year filter lifetime
Accurate filter lifetime tracking
App replacement alerts
Quick & easy filter changes

Features & Technologies

HEPASilent™ Technology captures 99.97% of airborne particles down to 0.1 microns.
OdorFence™ Technology captures and breaks down common odor gases.
7-stage filtration tackles particles, allergens and odors.
RealTrack™ Technology calculates remaining filter life based on fan speed, usage and pollution levels.
Replacement alerts tell you when it’s time for a fresh filter.
Durable filter design means fewer replacements.
Easy replacement keeps routine maintenance simple.

Fresh air you can feel and smell

7 stages of filtration capture tiny airborne pollutants while OdorFence™ Technology helps break down common odors.

Easy to replace. Easy to remember.

Simple filter changes and RealTrack™ monitoring take the guesswork out of keeping your purifier performing its best.

Smart filtration, you can trust

How to find your model

Unlock your phone & tap & hold it to the sticker on the cage of your device. It automatically direct you to the compatible filter.
Accurate filter lifetime tracking

Blueair’s proprietary RealTrack algorithm accurately calculates the remaining filter lifetime based on fan speed, usage time and pollution levels.
Subscribe & save 15%

Dirty filters clean the air less efficiently. Sign up for a filter subscription & get fresh filters delivered right when you need them.

7 stages of filtration,
10x more odor removal

HEPASilent filtration technology captures at least 99.97%² of tiny airborne pollutants down to 0.1 microns while OdorFence Technology captures common odor gases and breaks them down. It’s deep, effortless clean air you can feel, and smell, every day.

² Tested on PM2.5 up to 90 minutes.

Your cart

Blue Signature™ Replacement Filter

How to find your model

Accurate filter lifetime tracking

Subscribe & save 15%

7 stages of filtration,
10x more odor removal

Fresh updates
for fresher air

Your cart

Blue Signature™ Replacement Filter

Blue Signature™ Large Replacement Filter

Smart filtration, you can trust

How to find your model

Accurate filter lifetime tracking

Subscribe & save 15%

7 stages of filtration, 10x more odor removal

Fresh updates for fresher air

7 stages of filtration,
10x more odor removal

Fresh updates
for fresher air