One more thing to note... HVAC. Temperature will rise quickly with 17 60w halogens at 100%. About 2 degrees an hour with the HVAC running.
With 6 adults and the lights off/dim we went up 2 degrees in about 3 hours.
I figured the theater to maintain temps with 3 adults with the whole house AC; looks like I was right on target.
Equipment is not in the room, except the projector.
My hvac consists of:
1- 6" flex supply to a 2-slot x24" diffuser
1- 7" flex return to an 8x8 return box with filter grill
System is dead silent.. you cannot hear a thing. I have to hold my hand by the diffuser to see if it is running.
edit: I measured the air flow with an anemometer. The average across 8 points was 322 fpm. Ak is .049/ft. So it's pushing 31.5 cfm. 3 people need about 30 cfm. 1.5cfm left for the projector.. er about enough to cool 13w
Empirical evidence says otherwise.. I think those numbers a little low (maybe I have the wrong Ak). I wish I took a reading before I installed the diffuser.. to see what the flex was pushing.