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Fan Operating Limits
Do not exceed the operating limits in the following tables. A fan
wheel operated beyond the rpm and temperature limits shown
can suffer permanent distortion or fracture. The resulting
unbalance can cause severe unit vibration.
Table 19: Physical Data—Forward Curved and Airfoil Fans, Unit Sizes 107 to 169
Forward curved fans – in. (mm)
Diameter Class I
20 (508)
Maximum rpm
Shaft and bearing diameter
1.438 (37)
Outlet area – sq ft (sq m)
Diameter Class Il
20 (508)
Maximum rpm
Shaft and bearing diameter
1.688 (43)
Outlet area – sq ft (sq m)
Airfoil fans – in . (mm)
Diameter Class I
20 (508)
Maximum rpm
Shaft and bearing diameter
1.688 (43)
Outlet area – sq ft (sq m)
Diameter Class II
20 (508)
Maximum rpm
Shaft and bearing diameter
2.188 (56)
Outlet area – sq ft (sq m)
Diameter Class III
Maximum rpm
Shaft and bearing diameter
Outlet area – sq ft (sq m)
Table 20: Operating Limits—Belt-Drive Plenum Fans
Size
18
Max RPM Class II
2930
Max RPM Class III
3735
Table 21: Operating Limits—Direct-Drive Plenum Fans
Size
18
Max RPM Class II
3650
Max RPM Class III
3735
IM 915-13 • VISION - EXTENDED SIZES
22.38 (568)
25 (635)
1010
930
790
1.438 (37)
1.688 (43)
4.2
5.1
6.71
(0.39)
(0.474)
(0.623)
22.38 (568)
25 (635)
1281
1178
1011
2.188 (56)
2.438 (62)
4.2
5.1
6.71
(0.39)
(0.474)
(0.623)
22.25 (565)
24.5 (622)
2077
1875
1691
1.938 (49)
2.188 (56)
4.14
5.12
6.21
(0.385)
(0.476)
(0.577)
22.25 (565)
24.5 (622)
2703
2413
2199
2.188 (56)
2.438 (62)
4.14
5.12
6.21
(0.385)
(0.476)
(0.577)
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—
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20
22
24
2674
2403
2183
1860
3409
3065
2780
2423
20
22
24
2674
2403
2183
1981
3409
3065
2780
2423
27.62 (702) 30.25 (768)
33 (838)
690
650
600
1.688 (43)
1.688 (43)
2.188 (56)
8.07
9.3
12.05
(0.75)
(0.864)
(1.119)
27.62 (702) 30.25 (768)
33 (838)
910
835
763
2.438 (62)
2.688 (68)
2.688 (68)
8.07
9.3
12.05
(0.750)
(0.864)
(1.119)
27 (686)
30 (762)
33 (838)
1479
1328
1209
2.188 (56)
2.438 (62)
2.438 (62)
7.54
9.31
11.27
(0.7)
(0.865)
(1.047)
27 (686)
30 (762)
33 (838)
1928
1730
1579
2.438 (62)
2.688 (68)
2.938 (75)
7.54
9.31
11.27
(0.7)
(0.865)
(1.047)
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27
30
33
36
1783
1620
1465
2182
1984
1759
27
30
33
36
1783
1620
1465
2182
1984
1759
38
Daikin Applied EC Fan Array
36 (914)
—
—
560
—
—
2.188 (56)
—
—
12.8
—
—
(1.189)
36 (914)
—
—
715
—
—
2.688 (68)
—
—
12.8
—
—
(1.189)
36.5 (927) 40.25 (1022) 44.5 (1130) 49.0 (1244)
1073
972
884
2.438 (62)
2.938 (75)
3.188 (81)
13.79
16.77
20.5
(1.281)
(1.558)
(1.905)
36.5 (927) 40.25 (1022) 44.5 (1130) 49.0 (1244)
1401
1264
1146
2.938 (75)
3.438 (87)
3.938 (100) 3.938 (100)
13.79
16.77
20.5
(1.281)
(1.558)
(1.905)
36.5 (927) 40.25 (1022) 44.5 (1130) 49.0 (1244)
1758
1586
1421
3.438 (87)
3.438 (87)
3.438 (87)
13.8
16.8
20.5
(1.281)
(1.558)
(1.905)
40
44
49
1329
1202
1091
986
1598
1447
1314
1178
40
44
49
1329
1202
—
1598
1447
1314
1178
www.DaikinApplied.com
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805
3.438 (87)
24.9
(2.313)
1040
24.9
(2.313)
1308
3.938 (100)
24.9
(2.313)
54
60
891
1071
54
60
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—
1071
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