Elevation
Minimum Acceptable Vacuum
At sea level
70 kPa (21"-Hg)
5,000 ft above sea level
-57.8 kPa (17"-Hg)
10,000 ft above sea level
-47.6 kPa (14"-Hg)
15,000 ft above sea level
-37.4 kPa (11"-Hg)