Futuro Carbon Filter - Square (2-pack) | AC-CARBSQAll Futuro Futuro range hoods support ducted (exhausted) and ductless (recirculating) installations. When ducting isnt feasible, such as in high rise buildings or apartments, use the included Square Carbon Filter to absorb cooking odors and return clean air to your kitchen. Filters should be replaced every 2 3 months, depending on usage. The set includes two cartridges, with only one used at a time, and comes with mounting hardware. Ensure your