Advanced Fog of War - What is Cell Width

So the title pretty much says it. I am trying to figure out what this Cell Width is and what it is doing?

I assume you are talking about Page Setting cell width, not AFoW cell width. I don't recall AFoW having a cell width setting. Short answer? Leave it at 70 and never bother with it. It's more trouble than it is worth. Longer answer, you can use this to set up larger maps than you would normally (by having a cell width be 35, for instance), but it plays poorly with the token interface and the benefits are dubious over just making a larger map (IMHO).

I think FoW reveal is tied to the cell width, and can only go from corner to corner of cells. I've never played around with it though.