Compatible models: core 300 replacement filter is designed exclusively compatible with for Core 300 / Core300-P / Core 300S Air Purifier to keep working at its full capacity. Compared to Part # Core 300-. NOTE: This is not-original product but compatible with for air purifier replacement filter. Any use of the name or model designation for this product is made solely for purposes of demonstrating compatibility. The premium core 300 replacement filter for adopts H13 Grade True HEPA Filtration System (Nylon Preliminary Filter H13 Grade True HEPA Filter Activated Carbon Filter with ARC Formula) to take out 99.97% of substance down to 0.03 microns in size, automatically improving air quality and promoting better health and well-being . core 300 replacement filter for air purifier with h13 true hepa and granular activated carbon high-grade standard adopts advanced lower energy consumption and lower density structure technology by the manufacturer, with lower wind resistance, higher efficiency and less pressure to maximum filtration. And the upgraded electrostatic electret filter technology which used in hepa filter ensures energy saving and a longer service life. Enjoy fresh air all-year-round with Core 300 Replacement Filter for to ease uncomfortable symptoms caused by problematic air. The H13 true hepa filter works alongside the new fine non-woven fabric pre-filter and high-efficiency activated carbon filter with 60% more activated carbon and ARC Formula to take out 99.97% of the airborne substance as small as 0.03 microns and decomposes unpleasant household odors and wildfire gases. Package includes 2 x Core 300 True HEPA Replacement Filter and 1 x Clean Brush. Size: 7.56 x 7.56 x 5.75 inches. We recommend you to replace every 6-8 months for optimal performance (depend upon your environment and usage). Easy to replace and disposable, no tools required. Simply take out and replace from your machine unit when needed. Color:As Shown Material:Nylon + HEPA + activated carbon Package Contents: 2 * filter 1 * brush Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.