Hydrofarm FBA_ACAN14 Portable Air Conditioner, 14,000 BTU Corrosion-resistant galvanized Steel Changeable Velcro pre-filter to collect Dust and airborne Particles Charcoal is carefully packed to insure a consistent and even air flow High Grade activated charcoal to guarantee maximum odor control Large surface areas and 2.5" thick carbon bed results in optimum odor control and maximum efficiency