Drager BG4 Statements of Fact 2 Questions taken from 2017 Drager BG4 Statements of Fact Progress Indicator: Question 6 of 15 6.  A MINE SHAFT HAS A DIAMETER OF 15½ FEET, THE ANEMOMETER READING WAS 2,050 FOR 4 MINUTES, WHAT IS THE QUANTITY OF AIR? Choices: 93,755 cfm 95,405 cfm 96,705 cfm 98,805 cfm