On 8/14/06 at approx 8:10 am, while servicing the fan, a change in the mine pressure was recorded on Fan Chart and water gauge was noticed. Upon investigation, a roof fall in an intersection 3 X-Cuts from fan was discovered. This fall measures 18' x 18' x 8' and fall partially obstructs air flow and impedes travel of air course. The fan portal is located in the #5 Entry.