![Blueair Image Blueair Image](https://www.blueair.com/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw934384b2/UIUX2021/PLP/PLP-Air%20Purifiers-%20HEASIlent%20callout.png)
![Blueair Blue Pure 121 Comparison Image Blueair Blue Pure 121 Comparison Image](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw17685b3c/Blue%20121%20(1).png?sw=468)
Is this the right filter for you?
This filter is only compatible with the Blue Pure 121 air purifier, not the Blue Pure 211+. You can identify whether your air purifier is the 121 model, if it is 28.3” in height. The Blue Pure 211+ is 20” in height.
![Blueair Image Blueair Image](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw2d328b69/New/PDP%20-%20Body/121/Blueair-FilterPDP-Secondary03-BP121Particle+%20Carbon-0122-dsk.png?sw=468)
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 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- 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.
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Filter TypeParticle filter + Carbon sheet. Activated coconut shell carbon. Non-woven Polypropelyne fibers. Free of chemicals and binders. Fiber shedding resistance.
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Dimensions(HxWxD)20.1 x 20.7 x 3.1 in in
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Product weight8lbs
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Filter frame materialABS
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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 121 Blue Pure 121](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Sites-blueair-master-catalog/default/dw54440366/filters/blue/121-Filter.png?sw=450&sh=450&sm=fit)
This filter is compatible with the Blue Pure 121 model.
Purchasing a filter subscription saves you 15% on all future replacement filter orders + free shipping. 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.