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Appendix — Charts
Low Temperature Psychrometric Chart (-40 to 50ºF.)
Standard Atmospheric Pressure of 29.921 in HG
Atmospheric Pressure
at other altitude
Altitude Pressure
Ft. in HG
-1000 31.02
-500 30.47
0 29.92
500 29.38
1000 28.86
2000 27.82
3000 26.83
4000 25.84
5000 24.90
6000 23.98
7000 23.09
8000 22.22
9000 21.39
10000 20.58
15000 16.89
Courtesy of ASHRAE — Reproduced by permission.