"Matt" wrote:
But..... if the projector box is as sealed up with foam as you
described, how can the fan suck any air out of it at all?

The projector is mounted a few inches from the ceiling. The
space between the proj and the ceiling is sealed with foam. The
exhaust duct is inside that sealed area. The top side of the projector
has ventilation holes in it; since those are the only holes in the
sealed area, that's where the air flows. The exhaust fan sucks air
into the bottom of the projector, through the body where the heat gets
generated, and out through the duct. Just not fast enough.