Honeywell HRFAP1 Carbon Replacement Filter, For Round Honeywell Models, HWLHRFAP1, HWL HRFAP1, Universal Carbon Prefilter fits all round Honeywell models. The activated carbon prefilter reduces odors and captures large particles to extend HEPA filter life. Filter should be replaced every three months. UPC Code 092926000974, Quantity 1 EA