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Thank you for your interest in Blueair! Blueair filters are not True HEPA. Our air purifiers use HEPASilent™ technology, which combines electrostatic and mechanical filtration to capture 99.97% of airborne particles down to 0.1 microns. Because of this unique technology, our filters are less dense than a True HEPA version, while still achieving a high clean air delivery rate (CADR), which allows them to be quieter and energy-efficient. For more information, visit our website here: https://www.blueair.com/us/blueair-performance.html
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