Blueair’s HEPASilent™ technology is what makes Blueair air purifiers almost silent. In this technology, pioneered by Blueair, electrostatic filtration first makes airborne particles easier to trap by giving them a negative electrical charge. This negative charge makes the particles adhere to the polypropylene fibers in the filter more easily, which allows the use of a less dense filter, so more air can be pushed through with less noise and less energy.
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