![Blueair Image Blueair Image](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dwce56649e/UIUX2021/PDPs/Classic%20Filters/image%20184.png?sw=368)
![Blueair close up of particle filter material for Blueair Classic filter Blueair close up of particle filter material for Blueair Classic filter](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dwd800e977/UIUX2021/PDPs/Classic%20Filters/400%20particle/Blueair-FilterPDP-Secondary01-Classic200Particle-0122-dsk.png?sw=468)
Particle removing filtration & air cleaning, all in one filter
When used as part of our HEPASilent™ filtration process, the Particle filter provides protection against odors, chemicals, gases and 99.97% of airborne pollen, dust and germs.
![Blueair back view of classic air purifier Blueair back view of classic air purifier](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dwab91d23d/UIUX2021/PDPs/Classic%20Filters/400%20DP%20filter/Blueair-FilterPDP-Secondary03-Classic200Dual-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 Classic air purifier next to window in living room Blueair Classic air purifier next to window in living room](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Library-Sites-blueair-us-content-library/default/dw3341d58c/UIUX2021/PDPs/Classic%20Filters/400%20particle/Blueair-FilterPDP-Secondary03-Classic200Particle-0122-dsk.png?sw=468)
Does your household air require the added ability to filter both particles and annoying household odors, chemicals, and smoke?
![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 optimum 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.
![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 TypeFilter with thermally bonded fibers containing polypropylene and polyethylene free of chemicals and binders. Fiber shedding resistant.
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Dimensions(HxWxD)21 x 10 x 3.8 in (521 x 250 x 95 mm) in
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Product weight1.94 lbs
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Filter frame materialPaper
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Recommended filter change6 months (4,380 hours)
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Number of filters1
![Blueair Classic 400 particle filter Blueair Classic 400 particle filter](https://www.blueair.com/dw/image/v2/AASF_PRD/on/demandware.static/-/Sites-blueair-master-catalog/default/dwa5566d5d/filters/classic/Classic%20Particle/400/filter_alternate_anglesArtboard-16.png?sw=450&sh=450&sm=fit&q=100&strip=false)
This filter is compatible with the following Classic family models: 402, 403, 405, 410, 450E, 455EB, 480i.
No, Blueair filters are less dense than traditional HEPA filters, allowing our air purifiers to be quieter and more energy-efficient. Instead of HEPA filters, we use a combination of electrostatic and mechanical filtration that we call HEPASilent™ technology to achieve the same level of filtration efficiency - with less energy and noise.
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.
⁰ Based on Blueair internal tests
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.