Product review (3 stars): I don't have much experience with recirculating fans but supposedly ...
I don't have much experience with recirculating fans but supposedly this is a required type of filter to make them work.  This is the only filter that I could find for the Ikea range hood installed in my Kitchen.  Of course, I only needed 2 filter elements and the set came with three.  Buy 2 sets and get 1 free? I can't say that I'm impressed with the function of the filters when I'm running the fan but I suspect this is a common complaint for recirc fans with carbon filters.  The filter fits.  The  included clips work well to  retain the filters onto back side of the stock element.