In our lovely new house we have a ceramic/glass top stove with amatching microwave above it. The mic also acts as a range fan, vented to what I've learned is a slatted opening on the roof. Lucky for us, the vent cover seems to have been designed to work on the vertical plane, and as it's on the nearly horizontal, the happy little slats wave in the wind as if Brett Favre fans at a Packer game.

We had icicles hanging down from the interior roof of the microwave this morning. Luckily, the steam from my nuked oatmeal melted the little stagtites, so there will be no accidental back of the hand piercing.