Not on a table, my projector hangs upside from a typical ceiling mount. I noticed that when I first set it up and tuned it on, it ran really quiet until I selected the ceiling mode, and when it flipped the picture, the fan noise increased. As best as my research indicates, some (or maybe all?... I have no idea) projectors do this because the air is warmer at the top of a room and so the fan runs a little louder when ceiling mode is engaged. I guess regular mode assumes it sits lower on a table where the air is cooler. But surely the inversion itself has nothing to do with it, because there are no vents on top or bottom. Only front and back.
Since my HTPC video card has a mode to invert the picture upside down, I thought, why not use that and put the projector back to it's "normal" mode with the quieter fan. I found an old post on here from 2005 where someone talked about doing this. When I mentioned this in the Epson 8350 thread, there was some concern I shouldn't do it because the fan is meant to run stronger near a "warm" ceiling. But based on that old 2005 post, clearly this has been done before. Just wondering if anyone here might be doing it, and if I should be concerned or not about the projector and bulb cooling properly.
Of course time will tell, but I just tried this last time I was shutting everything down, so haven't let it run like this for any length of time. If the projector fan is smart enough to rev up when needed like a PC fan, then there should be nothing to worry about. So just want to put some feelers out there in case someone knows something.