CFS – Carbon Activated Pre-Filter Compatible with FLT4825 HEPA Filter, AC4800 Series, Filter B Models – Fresh and Filtered Air for Indoor – Charcoal Air Filter Sheet – 4.8"x15.75" (4 Pack)

CFS – Carbon Activated Pre-Filter Compatible with FLT4825 HEPA Filter, AC4800 Series, Filter B Models – Fresh and Filtered Air for Indoor – Charcoal Air Filter Sheet – 4.8"x15.75" (4 Pack)