The Coway AP-1008DH MCC (Multi Care Complex) Medium Filter removes 99.8% of yellow dust, 99.97% of influenza and 99.9% of legionella. Coway has combined 3 different filter types into 1 integrated filter to give you better protection and pure clean air. This filter is a must for those that have allergies. The MCC filter is designed to last 4 months before replacement.