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Originally Posted by tech2000
How tall is the cafeteria and how far down does the projector need to come? This would just help to find a good solution.
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Now we're getting somewhere! And keep in mind that even with a commercial mount for the projector you might have to first build a submount from
unistrut or similar between the beams or trusses to which the actual projector mount attaches. Also think about whether you need some type of enclosure for protection. Also consider access, you should clean the filter every month or so and will have to change the lamp(s) at some point. If you're going to be flying a projector 20' or 30' over people, I would really think about hiring a professional firm to do that, one that has the appropriate experience and liability coverage.
As far as cabling, what signals are going to the projector and where are they coming from? Having just one source or using a switcher/scaler for source switching so you have just one signal to the projector might lead to a different solution than if you have several different sources or signals going direct to the projector. So might if the cable run length is 20' or 200' or has to be plenum cable.