400.7 Fan Operation
Consult the information packet attached to your fan before proceeding with installation and wiring. If your
fan does not include an information packet contact the fan supplier. If Farr supplied your fan, contact Farr
Customer Service at (1-800-479-6801).
Trained and experienced personnel should make the selection of the fan that you require. The selection
of fan size is usually made from a fan performance table or a fan curve published by the fan
manufacturer. Refer to your General Dimensions drawing to determine the airflow rate and static pressure
required for your application. A performance table (Table 400.7.1) and fan curves (Figures 400.7.1-
400.7.9) for the standard fans provided by Farr have been included for reference when making changes
to your system. The static pressure performance curve (bold) designates the static pressure (left axis) at
a given airflow rate (horizontal axis). The brake horsepower curve (light) designates the actual
horsepower (right axis) required from the fan.
44
NYB 126GI-1.0-60-8
0.0
2.0
4.0
6.0
8.0
10.0
12.0
0
200
400
600
800
1,000
1,200
1,400
1,600
1,800
FLOW RATE (cfm)
STATIC PRESSURE (in. H
2
O)
1.0
1.5
2.0
2.5
3.0
3.5
4.0
BRAKE HORSE POWER
STATIC PRESSURE
BRAKE HORSEPOWER
Figure 400.7.1
1000 CFM, 7.9" H
2
O, 3500 RPM, 2.4 BHP
5
6
7
8
9
10
11
12
13
14
NYB 126GI-1.0-60-8
3
NA
1320
1173
989
769
360
NYB 146GI-1.5-60-10
5
1367
1228
1069
810
NYB 15PLR-2.0-60-9
5
2750
2580
2440
2231
2022
1639
NYB 15PLR-3.0-60-9
7.5
4100
3894
3683
3368
3052
2473
NYB 18PLR-4.0-60-9
10
4500
4415
4225
4158
4000
3850
3600
3491
3234
2926
NYB 18PLR-6.0-60-9
15
6800
6622
6420
6237
6000
5775
5500
5236
4851
4389
NYB 18PLR-8.0-60-9
20
9075
8829
8575
8316
8000
7700
7300
6982
6468
5852
NYB 18PLR-10.0-60-9
25
11100 10816 10500 10187
9850
9433
9000
8552
7924
7169
NYB 20PLR-12.0-60-9
30
13400 12800 12500 12200 11886 11550 11200 10750 10350
9830
FAN PERFORMANCE
Table 400.7.1
STATIC PRESSURE (IN WATER)
AIR FLOW RATE (CFM)
HP
MODEL
DESIGNATION