The Winix Replacement Filter D4 is a complete 1-year filter set. The True HEPA Filter captures 99.97% of particles and impurities as small as 0.3 microns， including pollen， dust， pet dander and hair， other allergens and cigarette smoke. The 4-pack Carbon Filters traps large particles， extending the life of the True HEPA filter and absorbs odor in the environment. The genuine Winix Filter D4 is compatible with Winix Air Purifier unit D480.

True HEPA filters capture 99.97% of particles and impurities as small as 0.3 microns， including: pollen， dust， pet hair and dander， other allergens and cigarette smoke

4-pack of carbon filters trap large particles， extending the life of the true HEPA filter and absorbs odors in the environment， genuine Winix carbon filters are used to combat volatile organic compounds (VOCs)， which are released from common household products， they also remove odors from the air， such as the smell of tobacco smoke and cooking odors

Recommended to change carbon filter every 3-months and true HEPA filter every 12-months

Compatible with Winix model D480