[COMPATIBILE MODELS]The 115115 Size 21replacement True HEPA filter is perfectly for Winix air cleaner models C535, 5300, 5300-2, 6300, 6300-2, P300, AM90, 9000, 5000, 5000B, Compared to Part 115115 Size 21 Filter A. [TRUE HEPA FILTERS] for Winix c535 Replacement Filter with true HEPA high efficiency filtration works for attaching of 99.97 percent of particles down to 0.3 Micrometres in size, keeps your air purifier running efficiently. [EASY TO USE and REPLACE]Contains 4 Pack C535 True HEPA filters ONLY. No carbon pre-filters. for Winix 115115 Replacement HEPA Filter Size: 16.3inch x 12.5inch x 1.18inch. It is easy to replace and , no tools required. Simply remove and replace from your air purifier unit when needed. [HIGH PERFORMANCE]Our 115115 HEPA replacement filter for Winix C535 is made of high quality, with higher efficiency and less pressure to ensure maximum filtration. Colour:White Material:composite material Package Contents: 4 x 115115 HEPA Replacement Filter 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.