Thought I would pass along this little nugget regarding hush box design. I've sent out emails to Epson, Panasonic, and JVC regarding the specifications for their projector cooling fans (6020, AE8000, and DLA-X55R respectively). As TMcG mentioned, Epson's stateside engineers don't have that information, but my request has been escalated, and they are checking with their Japanese counterparts to try to get the details. Will likely be a few weeks before I hear back. I got a fairly useless reply from Panasonic, but JVC came through in style.
According to the JVC reply, the DLA-X55R has multiple fans (no surprise there) and specifically two exhaust fans. Both of which are rated at 52 cfm.
Not sure how much that helps us. Rated flow is clearly different than actual flow, and I would venture to guess that the cramped internals of a PJ will likely reduce the flow, but I don't know by how much. So the question then becomes, do we design for 104 cfm of hot air, or something less, or I suppose more. Moving 100 cfm quietly is not an easy task.