First Aid Exam Taken from the 2014 Southeast Regional Mine Rescue Contest held in Dalton, GA Progress Indicator: Question 5 of 30 5.  A MINE ENTRY IS 4 FOOT HIGH, IS 18 FEET WIDE ACROSS THE TOP, 22 FEET WIDE ACROSS THE BOTTOM, THE ANEMOMETER READING WAS 500 FPM FOR 3½ MINUTES, WHAT IS THE QUANTITY OF AIR? Choices: 9,529 cfm 12,659 cfm 13,489 cfm 11,429 cfm