Originally Posted by c3lica
... I would let everyone know that the switch would need to stay on at least 30 min after the projector was off (ill double check the manual but definitely til the fans cut off in the projector)
I wouldn't go this route...as well intentioned as you are...one thing you can count on is human nature will take over and directions will not be followed until it's too late or something bad happens.
Can you take power from the ceiling fan sure...should you? Probably not.
With a little effort you could add a PIXIE
controller that would take care of startup, shutdown and external volume controls. Couple that with a wall mount input and you'd have a very clean install...