Friedrich AP260CFRK Annual Carbon Filter Replacement Kit for AP260 Optional carbon filter absorbs gaseous pollutants including VOCs, chemical vapors, and odors Perfect solution for household odors (pet, tobacco, cooking, etc.) Contains 2 activated carbon filters (replace every 6 months) Poor air quality may require more frequent replacement Optional Carbon Filter absorbs gaseous pollutants including VOCs, chemical vapors, and odors Perfect solution for household odors (pet, tobacco, cooking, etc.) Contains 2 Activated Carbon Filters (replace every 6 months*). *Poor air quality may require more frequent replacement.