Can the projector be 20 ft away from the screen?

What kind of projector? What kind of Screen? All of these things are vitally important.

I asked about what the equip. was because the type makes a huge difference. If you wanted CRT as opposed to lcd or dila all of this would factor into both screen size and distance. Each of these projectors depending on tube size or spec. has a fairly precise mathematical formula for determining distance to screen size. Also picture quality should be of parmount importance and CRT by a small edge still has the best overall picture quality, but light becomes a greater consideration. Another question is budget. It seems that your application would call for a DILA or LCd because you can generally use these at greater distance from the screen with larger screen size and still maintain decent quality. Dila is the latest and greatest and expensive. 9" CRTs might meet your needs with a 16:( 110" or greater screen. The prob. there is that a lot people have big bad screen envy and sacrifice quality for size. Big screen translate generally into quality degradation. Bottom line whats your budget? How picky are you? ECT.