i plan to do just that. but coal dust is an explosion hazard, so i plan to install a very high cfm blower with an external motor, sucking out of the coal bin (which is covered) and also from the hopper area, blowing out the side of the house.
i will use a bathroom fan timer switch, and give it ten mins so it clears out any remaining dust before it has a chance to settle.
also, i noticed when i blow my nose after moving the coal, its black. not that its all that bad for ya, but its an irritant. so i wear a respirator. once i have the neg pressure vent fan hooked into the bin, i should be breathing only fresh air.