I replaced a 2005 GE model microwave that was installed in an over the wall oven cutout. I was extremely limited in choice due to microwave dimensions. The replacement model is slightly deeper, which did not pose a problem. The height and width were the determining factors. I did have to use my existing frame, as the only frames available for the new model would not cover the cutout space. The existing metal frame had to be slightly trimmed. Although the wattage of the new model is exactly the same as the old model, I find that I need to add a little cooking time. My only complaint about the new model is that the interior light is very dim. The grey interior surface makes the food harder to see, and the interior light is of little help.