Winix Size 17 Replacement Filter Set (113050) compatiable with the Winix P150 Air Purifier (133000). This filter set is designed to last up to one full year and includes (1) True HEPA and (4) Odor Reducing Carbon Filters, with the Carbon Filters designed to be changed every 3 months. Keep odors away and air quality pure with new filters from Winix.