 Either a continuous ridge vent where we would cut about a three-inch wide slot all the way down the ridge of the roof and put a vent on top of that. Or you can have what we call gravity vents where they're just an eight-by-eight hole cut in your roof with a metal vent placed over top of that. And then, of course, there's always power attic fans. Okay. Does anybody – I see less and less of them anymore. I remember when I was a kid, I'd see more of those –