I have a typical in-wall filter in the hall of my house. I keep reading about how much better it would be for both the system and house air quality to have at least a 5 inch thick filter. Is it possible to replace the filter bracket housing with one that would allow me to fit a bigger filter in the unit? I have searched online and have yet to see any bracket offered that I could purchase. It is held in place by just 4 screws and looks really simple to replace. The bracket on the wall is by a door which has plenty of room to allow me to add a bigger bracket for the filter. Thanks for the input!