FORM 100.50-EG5 (108)
25
JOHNSON CONTROLS
Exhaust Fan Data
EXHAUST FAN MOTOR SIZING INSTRUCTIONS
In order to determine the proper exhaust fan motor size, add the return duct static pressure to the appropriate damper
pressure drop value in Table 14 to get the total static pressure applied to the exhaust fan. Based on the exhaust fan
airfl ow and total static pressure, determine the brake horsepower and RPM of the exhaust fan.
TABLE 15
– FORWARD-CURVED FAN
CFM STD.
AIR
Total Static Pressure (inches of water column)
0.3
0.5
0.8
1
BHP
RPM
BHP
RPM
BHP
RPM
BHP
RPM
6000
8000
10000
12000
14000
5.4
645
16000
5
528
5.7
584
6.4
633
7.2
680
18000
6.8
579
7.7
632
8.5
678
9.3
721
20000
9.1
632
10.1
681
11.1
725
12
765
22000
11.8
685
13
731
14.1
772
15.1
811
24000
15.1
739
16.4
782
17.6
821
18.8
858
26000
18.9
794
NOTE: For performance at operating points not included in these tables, consult your local YORK representative.
