Compatibility - Size 21 Replacement Filter A compatible with PlasmaWave Air Purifier models 115115, C535, 5300, 6300, 5300-2, 6300-2, P300, AM90, WAC5500, 290, 300, and DX95. Easy to replace and disposable, no tools required. High Quality - The 115115 HEPA filter captures 99.97% of airborne particulates, including household dust, pet dander, and pollen. The activated carbon filter helps remove odors from pets, smoking, cooking, and other sources. Replace the C535 HEPA filter every 6 to 12 months for best performance. This complete filter kit is easy to use and helps extend the life of your 115115 or C535 air purifier. Color: White. Material: Plastic. Size: 32 cm. Package Contents: 2 x HEPA Filter. Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.