![Blueair Additional carbon filtration Blueair Additional carbon filtration](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw094721da/EPA-UPDATE-FILTER-PDP-SB.png?sw=468)
Particle removing filtration, air cleaning carbon, all in one filter
Additional activated carbon removes 99.99%². of wildfire emissions for extra protection against smoke, toxic gasses, smog and odors.
![Blueair Blue pure 311 auto air purifier showing all various layers of filtration Blueair Blue pure 311 auto air purifier showing all various layers of filtration](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw86ab84de/UIUX2021/PDPs/Blue%20Filters/311%20Auto%20filter/Blueair-FilterPDP-Secondary03-BP311AutoParticle+%20Carbon-0122-dsk.png?sw=768)
Keep your filter fresh and pollutants at bay
We recommend replacing your air purifier filter about every 6 months (when used 24 hours a day). That's because, just like a vacuum cleaner, over time air purifier filters can get clogged with pollutants, and even let unpleasant odors back into the room.
It's simple to replace in just a few quick steps, and easy to save with our filter subscription program.
![Blueair Image Blueair Image](https://www.blueair.com/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw5b0dffac/New/Icons/New%20Icons%20July%2020/icon_removesodors_halfsize.png)
The ultimate tool against wildfire season. Additional activated carbon removes up to 99.99% of wildfire smoke* along with extra protection against other wildfire emissions such as toxic gasses, smog and odors**
![Blueair icon for Minimizes unhealthy allergens and germs Blueair icon for Minimizes unhealthy allergens and germs](https://www.blueair.com/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw3d4a9a05/New/Icons/New%20Icons%20July%2020/icon_trapsparticles_halfsize.png)
The particle filter layer helps to minimize the airborne particles that can trigger allergy symptoms, including pollen, dust, mold spores*, pet dander, viruses*, bacteria*, and fine smoke particles.
![Blueair icon- Keeps clean air flowing, resists clogging Blueair icon- Keeps clean air flowing, resists clogging](https://www.blueair.com/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dwe8472f2d/New/Icons/New%20Icons%20July%2020/icon_5airchanges_halfsize.png)
This filter's unique structure is designed to filter high volumes of air while trapping even the smallest particles. It maintains maximum airflow because it's engineered to resist clogging.
![Blueair icon- less noise and energy Blueair icon- less noise and energy](https://www.blueair.com/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw7bb56e18/New/Icons/New%20Icons%20July%2020/icon_lessdense_halfsize.png)
Our unique HEPASilent™ filtration technology allows this filter to be less dense, meaning it requires less air pressure. With it installed, your air purifier will operate quieter while using less energy.
![Blueair icon- Works 24/7, for six months straight Blueair icon- Works 24/7, for six months straight](https://www.blueair.com/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw1c67965c/New/Icons/New%20Icons%20July%2020/6%20month%20filter%20change%20icon.png)
To maintain optimal performance, we recommend changing your filter about once every 6-months when used 24 hours a day. Don't forget to save with our subscription program.
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Filter TypeParticle filter + Carbon sheet. Activated coconut shell carbon. Non-woven gradient Polypropelyne fibers. Free of chemicals and binders. Fiber shedding resistance.
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Dimensions(HxWxD)10.2 x 10.2 x 12.8 in
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Product weight0.75lbs
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Filter frame materialPP
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Recommended filter change6 months (4,380 hours) when used 24 hours a day
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Number of filters1
![Blue Pure 311 Auto Series SmokeBlock Filter Blue Pure 311 Auto Series SmokeBlock Filter](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Sites-blueair-master-catalog/default/dw939802b0/filters/blue/311AutoSB-Filter.png?sw=450&sh=450&sm=fit)
This filter is compatible with the Blue 311 Auto model.
Purchasing a filter subscription saves you 15% on all future replacement filter orders + free shipping and extends your limited 1-year product warranty to an extended warranty for as long as you remain a subscriber. At the time of purchase, the subscription will automatically schedule filter deliveries at the recommended six months. You can always adjust this timeframe from the 'My Account' section.
¹A flat shipping rate of $25.00 will be charged on filter shipments to Alaska and Hawaii. Additional charges may apply for shipments over 30 lbs.
²In 60min. Tested on PM 0.4-0.7 um (GB/T 18801-2015).
•Tested on E.coli, Influenza A (H1N1), A.niger with minimum reduction of 99.9% in 60min