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Figure 4-2
20 & 25 Ton Supply Fan Performance without Inlet Guide Vanes
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
CFM
STATIC PRESSURE, Inches w.c.
40% wocfm
50%
60%
S_HFC20 & 25 Ton
Dual 15 X 15 Fans
Entrance Losses
- without Inlet Guide Vanes
- without Evap Coil
- without Filters
- without Return Air Dampers
- without Exhaust Fan
Fan Curve Limits
- Minimum Motor HP = 3
- Maximum Motor HP
C20 & C25 = 15 HP
- Maximum RPM
3 HP - 5 HP = 1100
7.5 HP - 15 HP = 1655
- Maximum CFM
C20 = 9,000
C25 = 11,000
- Maximum Static Pressure
Leaving the Unit = 4.0" w.c.
90%
80%
70%
1700 RPM
1600 RPM
1500 RPM
1400 RPM
1300 RPM
1200 RPM
1100 RPM
1000 RPM
900 RPM
800 RPM
700 RPM
600 RPM
500 RPM
15 HP
10 HP
7.5 HP
5 HP
3 HP
20 HP
30 Ton Supply Fan Performance without Inlet Guide Vanes
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
CFM
STATIC PRESSURE, Inches w.c.
1400 RPM
800 RPM
900 RPM
1000 RPM
1100 RPM
120 0 R P M
1300 RPM
600 RPM
700 RPM
500 RPM
S_HFC30
Dual 18 X 18 Fans
Entrance Losses
- without Inlet Guide Vanes
- without Evap Coil
- without Filters
- without Return Air Dampers
- without Exhaust
Fan Curve Limits
- Minimum Motor HP = 5
- Maximum Motor HP = 20
- Maximum RPM = 1379
- Maximum CFM = 13,500
- Maximum Static Pressure
Leaving the Unit = 4.0" w.c.
5 HP
7.5 HP
10 HP
25 HP
15 HP
20 HP
3 HP
40% wocfm
50%
60%
80%
90% wocfm
70%