Alan Gibson , Nov 30, 1999; 09:57 p.m.
Dust should only cause a problem on film. Anywhere else, it really doesn't matter, so long as it doesn't blow on to your film. Brush off the film before you put it in your (clean) enlarger or scanner.
If you use LF film, see that forum for tips on loading film holders. If you process B&W film, see that forum for tips on keeping your film clean as it dries.