The Winix 115115 (Filter A) True HEPA Filter is a replacement cartridge designed for air purifiers. It is compatible with the Winix C535, 5300-2, and 6300-2 models. The filter is made of activated carbon and HEPA technology, which helps to remove particles, allergens, and odors from the air. It is easy to install and can last up to 12 months. The filter measures 2.2 inches in depth, 16.6 inches in height, and 13 inches in width. It is white in color and features a HEPA filter.