Four experienced men and a contractor could not figure out how to insert the charcoal filters into the fan unit.  We called the place of purchase, GE Appliances, and you tube without success.  We finally just left the charcoal filters out (along with the extra one that I had purchased).  You need to revisit your instructions. Nobody could sort out where the filters went.   We will run it with just the grease filters and use it for the light.   Very expensive light.