FEATURES * Replacement Filter for ADH70: Only compatible with Day Dawning ADH70 Air Purifier, a desktop purifier for Home, Office Desk, Room or Desktop. * 360° Cylindrical Pollutant Removal: 360° cylindrical air filters work efficiently to capture pollutants, including dust, smoke, pet dander, odor, etc. * TRUE HEPA Technology: Preliminary filter, true HEPA filter, activated carbon filter, effective to capture and hold particles as small as 0.1 microns. * Filter Change Reminder: When the speed indicator keeps flashing in blue, it is a reminder to check and change the filter, which is supposed to be every 6-8 months depending on its condition. WHEN? * Replacing the air filter every 6-8 months for optimal use (or according to your air filter status). * It is time to replace the air filter when the following signals appear: increased noise, decreased airflow, clogged filters, presence of odors from the unit. HOW? * Rotate the bottom cover counterclockwise and remove the filter. * Remove the plastic seal from the filter. * Place the filter back into the unit. Make sure the tag of the filter is facing outward. Close the bottom cover by rotating it clockwise. Frequently Asked Questions * What's a True HEPA Filter? HEPA stands for High-Efficiency Particulate Air. HEPA filters, originally designed by the U.S. Army to remove radioactive materials from the air, are the most effective way to remove pollen, dust, and other indoor particle pollutants. A True HEPA filter can remove 99.97% of airborne particles 0.3 microns or larger-- that's 166 times smaller than a human hair. Sometimes, you may see some filters named HEPA-like or HEPA-style, or HEPA-type. Unlike true HEPA filters, these filters cannot actually remove 99.97% of bacteria down to 0.3 microns in diameter. * What’s the difference between HEPA and Medical Grade HEPA Filter? Generally speaking, the higher the HEPA filter grade, the better the purification effect. True HEPA filters usually range from H10-H12. And the highest grade of HEPA filter is H13-H14, which is considered to be medical grade. A normal HEPA filter (H10-H12) removes 99.97% of particles that are 0.3 microns or larger while a medical grade HEPA filter removes 99.97% of particles that are 0.1 microns or larger. If you need the Medical Grade H13 filter, please click here to learn more: https://airthereal.com/pages/accessories * Can the True HEPA filter block the virus like the coronavirus?