The WB02X35687 Microwave Charcoal Filter is used in the making of this particular charcoal filter and is aimed at neutralizing smoke, grease, and obnoxious smells to give the kitchen a clean atmosphere. It operates by trapping the air as it circulates through the microwave’s ventilation system to effectively trap cooking smells. This filter can be installed to improve the efficiency of the microwave and to minimize the amount of cleaning that is required.