This Range Hood Recirculation Kit Can Be Used When Venting To The Outside Is Either Not Possible Or Not Desirable. This Recirculation Kit With Charcoal Filters Can Be Used To Freshen Air And Recirculate It Back Into The Kitchen. If The Your Range Hood Is Not Clearing The Air As Expected, Installing This Accessory May Alleviate The Issue. Kit Includes (1) Charcoal Filters And (1) Vent Cover. Installing This Accessory Will Require Basic Hand Tools, Some Disassembly Of The Range Hood And Novice Repair Experience. You Must Unplug The Hood Or Shut Off The House Circuit Breaker For The Appliance Before Installing This Accessory.