Product review (5 stars): Works well.
I have a bathroom style exhaust fan in the ceiling of my kitchen. It broke for the previous owner because it had no filter and too much grease got on it. After I replaced the fan, I wanted to put in a filter to keep it from breaking again. The big box hardware store attendants had no idea that a filter like this existed and actually told me to try to cut a square one to fit it. I was able to find the filter on my own by googling the serial number of the fan I installed. I'm glad Amazon carries it!

I've had the filter for three years now.  It's holding up really well.  I take it out to clean it every couple of months or so. It's easy to take out and put back in. It cleans very easily with some hot soapy water. It still looks like new after I clean it.