1.HEPA 13, Merv 17, Fiberglass, Carbon Fiber 2. - The premium 115115 replacement filters combo pack is designed exclusively compatible with Winix PlasmaWave Air Purifier C535, 5300, 5300-2, 6300, 6300-2, P300, C535, AM90, 9000, 5000, 5000B, C909, 9800. Replacement for Winix 115115 Size 21 Filter A ② NOTE: This is not OEM product. Using Replacement Filters guarantees the performance for your air purifier and ensures what you're buying is worthy of your investment 3. - air purifier filter replacement for winix is made of high quality HEPA 13 / MERV 17 non-woven fabric and activated carbon fiber, both adopt advanced lower energy consumption and lower density structure technology verified by the manufacturer, with higher efficiency and less pressure to ensure maximum filtration. And the upgraded electrostatic electret filter technology which used in hepa filter ensures energy saving and a longer life 4. - Enjoy fresh air all-year-round with 115115 Replacement Filters A for Winix PlasmaWave Air Purifier to ease uncomfortable symptoms caused by problematic air. The True HEPA Filter works alongside the High-Efficiency Activated Carbon Pre-Filter to capture up to 99.97% of particles as small as 0.03 microns and decomposes unpleasant household odors and wildfire gases, keeping your air purifier running efficiently and quietly 5.- - Package includes 2 x 115115 HEPA Replacement Filter and 8 x Activated Carbon Pre-Filter. HEPA Filter Dimensions: H: 16-1/2' x L: 12-4/5' x W: 2.0' inches, Carbon Filter Dimensions: H: 16-1/10' x L: 12-3/5' x W: 1/5' (Please refer to the picture for details)! Our 115115 replacement filters combo pack contains all the required parts to complete the standard installation of your air purifier 6. - We recommend you to replace the hepa filter every 6-8 months and pre-filter every 2-3 months for optimal performance (depending upon your usage and environment). Easy to replace and disposable, no tools required. Simply take out and replace from your machine unit when needed