Airflow Data; Fan Ratings - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

AIRFLOW DATA

FAN RATINGS

Fans are rated at standard conditions of air: 1.2041 kg/m
conditions must be used when selecting fans from fan rating tables or curves. Table 21 gives correction factors.
Pressure at operating conditions x factor = pressure at standard conditions.
Horsepower at standard conditions
CAUTION: Size motor for highest density (lowest factor) condition at which it is expected to operate.
Temp m 0
C kPa 101.33 95.46
-40 0.79
-30 0.83
-20 0.86
-10 0.89
0 0.93
10 0.96
20 1.00
30 1.03
40 1.06
50 1.10
60 1.13
70 1.17
80 1.20
90 1.23
100 1.27
125 1.35
150 1.44
175 1.52
200 1.61
225 1.69
250 1.78
275 1.86
300 1.95
325 2.03
350 2.12
375 2.20
400 2.29
EXAMPLE:
Air at 1000m and 60 C: 89.88 kPa x 1.28 = 115.05 kPa
ENGINEERING MANUAL OF AUTOMATIC CONTROL
factor = horsepower required at operating conditions
Table 21. Altitude and Temperature Correction Factors.
Altitude (m) with Barometric Pressure (kPa)
500 1000 1500
89.88 84.56
0.84 0.89 0.95
0.88 0.93 0.99
0.91 0.97 1.03
0.95 1.01 1.07
0.99 1.05 1.11
1.02 1.09 1.15
1.06 1.12 1.19
1.09 1.16 1.23
1.13 1.20 1.28
1.17 1.24 1.32
1.20 1.28 1.36
1.24 1.31 1.40
1.27 1.35 1.44
1.31 1.39 1.48
1.35 1.43 1.52
1.44 1.53 1.62
1.53 1.62 1.72
1.62 1.72 1.83
1.71 1.81 1.93
1.80 1.91 2.03
1.89 2.00 2.13
1.98 2.10 2.23
2.07 2.20 2.33
2.16 2.29 2.44
2.25 2.39 2.54
2.34 2.48 2.64
2.43 2.58 2.74
3
and 20 C at sea level. Therefore, pressures corrected to standard
2000 2500 3000
79.50 74.69 70.12
1.01 1.08 1.15
1.05 1.12 1.19
1.10 1.17 1.24
1.14 1.21 1.29
1.18 1.26 1.34
1.23 1.31 1.39
1.27 1.35 1.44
1.31 1.40 1.49
1.36 1.44 1.54
1.40 1.49 1.59
1.44 1.54 1.64
1.49 1.58 1.69
1.53 1.63 1.73
1.57 1.67 1.78
1.62 1.72 1.83
1.72 1.84 1.96
1.83 1.95 2.08
1.94 2.07 2.20
2.05 2.18 2.32
2.16 2.30 2.45
2.27 2.41 2.57
2.37 2.53 2.69
2.48 2.64 2.81
2.59 2.76 2.94
2.70 2.87 3.06
2.81 2.99 3.18
2.92 3.10 3.31
477
GENERAL ENGINEERING DATA
3500 4000 4500
65.78 61.66 57.75
1.22 1.30 1.39
1.27 1.36 1.45
1.33 1.41 1.51
1.38 1.47 1.57
1.43 1.53 1.63
1.48 1.58 1.69
1.54 1.64 1.75
1.59 1.69 1.81
1.64 1.75 1.87
1.69 1.81 1.93
1.74 1.86 1.99
1.80 1.92 2.05
1.85 1.97 2.11
1.90 2.03 2.17
1.95 2.08 2.23
2.08 2.22 2.37
2.22 2.36 2.52
2.35 2.50 2.67
2.48 2.64 2.82
2.61 2.78 2.97
2.74 2.92 3.12
2.87 3.06 3.27
3.00 3.20 3.42
3.13 3.34 3.57
3.26 3.48 3.72
3.39 3.62 3.86
3.52 3.76 4.01
5000 5500
54.05 50.54
1.49 1.59
1.55 1.66
1.61 1.73
1.68 1.79
1.74 1.86
1.80 1.93
1.87 2.00
1.93 2.07
2.00 2.13
2.06 2.20
2.12 2.27
2.19 2.34
2.25 2.41
2.31 2.47
2.38 2.54
2.54 2.71
2.70 2.88
2.86 3.05
3.01 3.22
3.17 3.39
3.33 3.56
3.49 3.73
3.65 3.91
3.81 4.08
3.97 4.25
4.13 4.42
4.29 4.59