Hunter HP400 Air Purifier Replacement Filter Value Pack Make great-smelling air a priority in your home with this HEPA filter value pack. The HEPA filter removes up to 99.97% of airborne particles as small as 0.3 microns in size, and the pre-filter acts as the first layer of filtration to capture larger particles before reaching the HEPA filter, thus extending the life of the HEPA filter. Take a deep breath and smell the freshness. What You Get Hunter H-HF400 True HEPA replacement air purifier filter (2) Hunter H-PF400 EcoSilver replacement air purifier pre-filters Good to Know It is recommended under normal conditions of continuous use, the HEPA filter should be replaced every 6 months (approx. 4,320 hours). The pre-filter should be replaced every 3 months (approximately 2,160 hours). Filters should be checked every 12 months and replaced at least every 18 months. Coconuts are sustainably grown and grown more quickly and with less negative impact to the environment than comparable carbon product from bamboo. Fits Hunter Large Console Air Purifier models: HP400, HP400BL, HP400WH and HP400GR. Fits HSN Item #680927 and #694292.