Filter dimension: 16.4" x 13.4" x 2.6". Pre Filter should be replaced every 2 - 3 months. Suggest replacing the HEPA filter and the Carbon VOC filter every 6 months for best result. It also captures any harmful VOC chemical to bring you peace of mind for the indoor air Preliminary carbon pre filter helps extend HEPA filter life span by preventing hair, dust and debris from entering the device This order will include a true HEPA filter, two activated carbon VOC filters and 4 sheet of carbon pre filters. Activated charcoal help deodorizing the unfavorable household smell such as smoke from cigarette, cooking smell, pet smell. High superior True HEPA filter capture 99.97% of airborne particles down to 0.3 microns. air purifier model AD3000. Nispira premium filter kit set appropriate with Air Dr
