About this item. 
Philips FY5182 Active Carbon Filter for Model AC5659
HEPA: The reassurance of 99.97 percent purification with nano protect true HEPA filter
HEPA+Filter Set for Air Purifier Model AC5659
HEPA: The nano protect HEPA filter captures 99.97 percent 0.3 micron particles and ultra-fine particles as small as 0.02 microns (over 100 times smaller than PM2.5)
HEPA: Filters common allergens, dust, dust mites, pollution, bacteria and viruses (including H1N1)
Carbon: Honeycomb structured activated carbon filter provides effective removal of harmful TVOCs and odors
Carbon: Unfolded activated carbon absorption area is equivalent to about 20 football fields to provide superior and consistent protection
Healthy air protect alert on the purifier warns you when to replace the filter
Easy-to-install DIY (do it yourself) filter