>Why do microwaves (mine at least) have a perforated wall in back? Is it >where all the microwaves come from? possibly, how big is the area? They come from the upper right hand corner on mine. >It's an old microwave, probably ~10yrs. It's been in the shop, the door >was out of alignment and it kept turning off. mine did that, but my dad fixed it. >LARGE microwave. Probably >100 pounds. This thing is huge!!! Wow, that is big!