I promise these didn't. No vent connected to one that was supposed to have it, easy to see in the cabinet above it. The other two were microwaves that eject the

I promise these didn't. No vent connected to one that was supposed to have it, easy to see in the cabinet above it. The other two were microwaves that eject the air straight out the front. They're designed to do that. So, it's a thing.