The actual dimensions on my filters were a quarter inch shorter then these filters, just an odd size. So i felt to just get this size and it should clear the opening. Nope...Even though it was my goofup, they made it right...
Make sure you look at the actual size of the filter you are purchasing. I did not. I was excited about finding filters at an economical price. But filters are 5/8-inch small height and width, 3/8- thickness so do not fit properly in my unit. They allow airflow around the filter.
The 4 inch filters used to be 6 inches instead. Not sure what is going om. Tjere were stickers on top of the original stickers and dont think they are the correct size either.