A:Answer 120” is the max; works best with taller ceilings. I’m trying it out in my basement, which has a 93” ceiling- the projector has to be about 11” off the floor to fit that ceiling height. Also, the SmartFIT doesn’t work reliably, and if you put into game mode, you lose any manual settings. I have until 10/24 to return it; jury is still out. Also, though I’m using an ALR screen, still a poor picture in ambient light, and still a bit dark image with lights out.
I suspect the unit would work better with a higher ie, 9 ft or taller ceiling.
Hope that helps!