I will have to look at the box. Seems to me there were a couple of capped off holes I could use. There are no 'vents' to block off underneath - their idea of directing air to the floor is to run the hose to the edge of the dash and screw the open end so it faces down. I had to replace a couple of hoses because they'd been zap strapped flat. Thought that was part of the initial problem, but there was a vaccuum hose to the engine that had deteriorated. Now I just need to direct the AC where I want it....and those rectangular vents are so '70's.