Product review (5 stars): Broan BPQTF Non-Ducted Charcoal Replacement a Good Deal for not much money.
This is just a mesh weave filter to help capture grease and other particulates that result from the cooking of food on a range top. This filter snaps into place with no effort at all in the properly sized slot. This screen catches most big fat cooking particulates and many of the smaller ones.  Let it soak in hot soapy water for easy clean up. I use this filter in a non-ducted range hood system and it works fine. I did not have a range hood over my stove so the particles kept setting off the smoke detectors. Since installing the range hood and this filter I heard nothing from the smoke detectors.