FEATURES * HEPA Technology: An advanced HEPA filter is truly effective to remove 99.97% of dust, pollen, pet dander, odors, bacteria, VOCs, mites, smog and cooking oil. * 360° Cylindrical Design: 360° cylindrical air filter can capture pollutants and purify the air in all directions. * High-Quality Aluminum Mesh Cover: Using an aluminum mesh cover, it can not only make it more durable, less prone to damage but also captures large particles more effectively. * Higher Dust-Holding Capacity: Made with thousands of layers of glass threads, and formed with a continuous mountain folded shape, high-density HEPA filter has a higher dust-holding capacity and higher filtration efficiency. * Filter Replacement Alert: Please remove the plastic seal from the new filter before running the air purifier. When the filter icon keeps glowing, it is a reminder to check and change the air filter. WHEN? * Replacing the air filter every 6-8 months is recommended 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? * Unplug the air purifier and remove the front shell. * Remove the old filter and then unwrap the new air filter. * Install the new filter and make sure the pull-tab on the filter is facing outward and put the front shell back. * Press and hold the FAN and TIMER button simultaneously for 3 seconds to reset the unit. Then the replacement reminder will be off. 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.