DFOS-103 - page 26

135
150
165
182
200
222
245
270
300
330
365
402
445
490
542
600
660
730
807
890
3542
3246
2886
2653
2355
2205
1991
1809
1663
1433
1318
1141
1043
939
858
775
695
637
576
518
5.4
5.9
6.6
7.2
8.1
8.7
9.6
10.6
11.5
13.3
9.3
16.7
18.3
20.3
22.3
24.6
27.5
30.0
33.2
29.5
4607
4221
3753
3437
3063
2868
2590
2353
2163
1863
1715
1483
1360
1224
1120
1011
906
831
751
675
4.1
4.5
5.1
5.6
6.2
6.7
7.4
8.1
8.8
10.3
11.1
12.9
14
15.6
17.1
18.9
21.1
23.0
25.4
22.6
5794
5309
4721
4323
3853
3607
3258
2959
2720
2344
2157
1866
1706
1535
1404
1268
1136
1042
942
847
FAN
SIZE
RPM
RPM
RPM
FANSHEAVE
PITCHDIA.
FANSHEAVE
PITCHDIA.
FANSHEAVE
PITCHDIA.
CLASS I
CLASS II
CLASS III
Sound Levels
135
150
165
182
200
222
245
270
300
330
365
402
445
490
542
600
660
730
807
890
29
32
35
38
41
44
42
45
48
52
55
59
63
66
69
72
75
78
81
84
32
35
38
42
44
48
45
48
52
55
59
63
66
69
73
76
79
82
85
88
35
38
41
45
47
51
48
51
55
59
62
67
70
73
76
79
82
85
88
38
41
44
47
50
53
51
54
58
61
65
70
73
76
79
82
85
88
42
46
49
52
55
58
56
59
63
67
70
75
78
81
84
87
46
50
53
56
59
62
60
63
67
71
74
79
82
85
89
50
53
56
59
62
66
64
67
70
75
78
83
86
53
56
59
62
65
69
67
70
74
78
81
87
56
59
62
65
68
71
70
73
76
81
84
60
64
67
70
73
76
75
78
81
64
68
71
74
77
80
79
68
71
74
77
80
84
71
74
77
81
83
FAN
SIZE 700 800 900 1000 1200 1400 1600 1800 2000 2400 2800 3200 3600
FANSPEED - RPM
BEARING LIFE
SOUND LEVELS
R/F
R/F
4
4.4
5
5.3
6
6.5
7
8.1
8.9
10.2
11.2
12.4
13.6
15.1
16.8
R/F
R/F
R/F
26
Table lists estimated sound levels (dBA) for
each fan size at various speeds within the
fan’s normal operating range. To determine
dBA for a selected fan, locate the intersection
of the fan size and the closest RPM.
NOTES:
1. Sound levels are based on tests conducted in accor-
dancewithAMCAStandard300, Set-UpNo. 1.
2. Sound level computations arebasedononadistanceof
10' from the fan’s open inlet in a free fieldenvironment.
3. Specificoctavebandsoundpower levelsandsoundpres-
sure levels availableon request.
4. Sound levels of installed fans can vary greatly from lab-
oratory tests. The dBA ratings are only to be used as
estimates. Any comparisons and detailed calculations
should be based upon sound power levels, which are
independant of the installation.
5. AMCA Certified Ratings Seal applies to air performance
only.
Bearing Life
Bearing lifemay be substantially increased or
decreased by variations in the operating
speed. The table at right lists the design
speeds (RPM) and fan sheave pitch diameters.
The graph below the table plots the increase
or decrease in bearing lifewhen the RPMor
fan sheave pitch diameter is changed from the
values in the table. Minimumaverage bearing
life is 75,000 hours.
EXAMPLE:
Determine the increased bearing life of a Size
402 Class I fan operating at 785 RPM. Assume
the actual fan sheave pitch diameter of 18.7
inches.
1. Calculate operating RPMas a percent of the
design RPM.
785 RPM÷ 1141 RPM= .688 x 100 =
68.8%. (Use 69%)
2.Calculate actual fan sheave pitch diameter
as a percent of the design fan sheave pitch
diameter in the table.
18.7" ÷ 16.7" = 1.11 x 100 = 111%
3. Locate the intersection of 69%of design
RPMand 111%of design fan sheave pitch
diameter in the graph. The increased bear-
ing life is 10 times the designminimum
bearing life or 750,000 hours minimum
average life.
PERCENTOFCLASSMAXIMUM
R/F: Refer to Factory.
Standard LifeTimes 20.0
Standard LifeTimes 15.0
Standard LifeTimes 10.0
Standard LifeTimes 7.0
Standard LifeTimes 5.0
Standard LifeTimes 3.0
StandardBearingLife
1...,16,17,18,19,20,21,22,23,24,25 27,28,29,30,31,32
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