Product review (5 stars): It's not an air filter it's a gresa trap.
fits well, has black carbon filter  in between the stainless mesh, good air flow, I have read some of the reviews where people say they can see thru it and they don't like that, but as this is not an air filter like in a car you need to be able to see thru it or it will clog with oil in a very short time as these are designed to catch the oil in your cooking and give it a place to collect so it does not get all over the up tube on the vent hood, if you don't understand what these are for maybe these people should not be aloud to use a stove.