Alexapure NanoProtect Active Carbon Replacement Filter Purifier Series 2000 and 2000i, pcs810, Brown807Active carbon replacement filter for Philips air purifier series 2000 and 2000I Effectively reduces gases and odors from the air that passes through the filter High quality filter with extra strong honeycomb structure Needs to be replaced approximately every 6 months, based on an average usage of 12 hours per day This is a Philips replacement part for model number FY2420 40