Document wDjMqQ1E0eo9JLdmLOvgxBJNd
744
_____________C H A P T E R 41
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Table 1. Circular Equivalents op Rectangular Ducts for Equal Friction--(Continued)
Bibb
Rectanqulab 4 '
5
.6
7
8
9
Duct
8 6.1 ' 6.9 7.6 8.2 8.8 9 6.5 7.3 8.0 8.7 9.3 9.9 10 6.8 7.7 8.4 9.2 9.8 10.4 u 7.1 8.0 8.8 . 9.6 10.2 10.9
12 7.4 8.3 9.2 10.0 10.7 11.4 13 7.6 8.7 9.6 10.4 11.1 11.8 14 7.9 8.9 9.9 10.8 11.5 12.3 15 8.2 9.2 10.2 11.1 11.9 12.7
16
.8.4
9.5 10.5 11.4 12.3 13.1
17 8.6 9.8 10.8 11.8 12.6 13.5
18 8.9 10.0 11.1 12.1 13.0 13.8
19 9.1 10.3 11.4 12.4 ,13.3 14.2
20 9.3 10.5 11.6 12.7 13.6 14.5 22 9.7 11.0 12.1 13.2 14.2 15.2 24 10.0 11.4 12.6 13.8 14.8 15.8 ' 26 10.4 11.8 13.1 14.3 15.4 16.4
28 ' 10.8 12.2 13.5 14.8 15.9 17.0 30 11.0 12.6 13.9 15.2 16.4 17.5 32 11.3 12.9 14.3 15.6 16.9 18.0 34 11.6 13.2 14.7 16.1 17.3 18.5
36 ' 38
40 42
11.9 12.2
12.5 12.7
13.6 15.1 13.9 . 15.4 14.3 15.7 14.5 16.1
16.4 10.8
17.2 17.6
17.7 18.2 18.6 19.0
19.0 19.4 19.8 20.3
44 13,0 14.8 16.4 18.0 19.4 20.1 46 13.3 15.1 16.7 18.4 19.8 21.1 48 13.5 15.4 17.0 18.7 20.1 21.5 50 13.7 15.7 17.3 19.0 20.4 21.9
o 52 13.9 15.9 17.6 19.2 20.8 22.2 54 14.1 16.1 17.9 19.6 21.1 22.6 56 14.3 16.3 18.2 19.9 21.5 22.9 58 14.6 16.6 18.4 20.2 21.8 23.3
60 62 64 66
14.7 15.0 15.1 15.3
16.8 17.0 17.3 17.5
18.7 19.0 19.2 19.5
20.4
20.7 21.0 21.2
22.1 22.4
22.7 23.0
23.6 24.0 24.3 ' 24.6
10 11
11.0 11.5
12.1
12.0
12.5 12.9 13.4
12.6
13.1 13.6 14.1
13.8 14.2 14.6 15.0
14.5 15.0 15.4 15.8
15.4 16.1 16.8 17.3
16.2 16.9 17.6 18.3
18.0 18.5 19.1 19.6
19.0 19.S 20.1 20.7
20.1 20.6 21.1 21.6
- 21.2 21.7 22.2 22.7
22.0 22.4 22.8 23.2
23.1 23.6 24.1 24.5
23.6 24.0 24.4 24.7
24.9 25.3 25.7 26.1
25.1 25.5 25.9 26.2
26.5 26.9 27.3
27.7
12 13
13.2
13.7 14.3 14.7
14.3 14.9 15.3
15.2 15.7 16.1 16.5
15.8 16.3 16.8 17.2
17.0 17.8 18.5 19.2
17.6 18.5 19.3 20.0
19.8 20.5 21.1 21.6
20.7 21.4
22.0 22.6
22.2
22.8 23.3 23.8
23.2 ' 23.8
24.4
24.9
24.3 24.8 25.2 25.7
25.4 25.9 26.4 26.9
26.2 26.6 27.0 27.4
27.4 27.8 28.3 28.7
27.8 28.2 28.6 29.0
29.1 29.5 29.9 30.3
14 . 15 16 17 18
15.4 16.0
16.5
16.5 17.0 17.4 17.9
18^4
19.2 20.0 20.8
17.1 17.6 18.1 18.6
19.0 19.9 20.8 21.6
17.6 18.2 18.7 19.2
19.7 20.6 21.5 22.3
18.7 19.2 19.8
20.3 21.3 22.2 23.0
19.8 20.4
20.9 21.9 22.8 23.8
21.5 22.2 22.9 23.5
22.4 23.1 23.8 24.4
23.1 23.9 24.6 25.3
23.9 24.7 25.4 26.2
24.6 25.4 26.2
26.9
24.2 24.8 25.4 25.9
25.1 25.8 26.4 26.9
26.0 26.7 27.3 27.9
26.8
27.5 28.2 28.8
27.7 28.4 29.1 29.8
26.5 27.0 27.5 28.0
28.5 29.0 29.5 30.0
27.5 28.1 28.6
29.2
28.5 -,,29.1
29.6 30.3
29.6 30.1 30.6 -31.1
30.7 31.2
31.7 32.2
29.5 30.1 30.5 31.3
30.3 31.0 31.6 32.2
' 31.8
32.3 32.8 33.3
. 32.9 33.4
33.9 34.4
30.5 30.9 31.3 31.7
31.6 32.1 32.6 33.0
32.7 33.2 33.7 34.2
33.8 34.3 34.8
35.3
34.9 35.4
35.9 36.4
19 20 21
20.9
21.5 22.5 23.5 24.4
25.3 26.2 27.0 27.7
28.5 29.2 29.9 30.7
31.2 31.9 32.5 33.1
33.8 34.4 34.9 35.4
36.1 36.6 37.1 37.6
22.0 23.1 24.0 25.1
23.6 24.7 25.7
26.0 26.8 27.7 28.5
26.6 27.5 28.4 29.2
29.3
30.0 30.8 31.4
30.0 30.8 31.6 32.2
32.1 . 32.8 ' 33.4 34.1
32.9 33.8 34.3
35.0
34.7 35.3 .35.9 36.4
35.6 36.3 36.9 37.4
37.1 37.7 36.2 38.7
38.1 38.7 39.2 39.8
22
24.2 25.2 26.3 27^3 28.2 29.1 30.0 30.8 31.5 32.4 33.0 33.7 34.6 35.2 35.9 36.5 37.2 37.8 38.4 39.1 39.6 40.2 40.8
24
26.4 27.5 28.5 29.5 30.5 31.3 32.2 33.1 33.9 34.5 35.3 36.2 37.0 37.6 38.3 38.9 39.6 40.3 40.9 41.6 42.2 42.8
'.
1946 G u id e
a
A ir DuCt Design
Table 1. Circular Equivalents of Rectangular Ducts for Equal Friction--(Concluded)
SlDB
Bidb
Riotakquiab
26
28
30
32
34
36 38 40 42 44 46 48 RlCTANODLAa 50 54 60 66 72 78 84 88
Duct
Duct
26 28.6 28 29.7 30.8 30 30.7 31.9 33.0
50 55.0 52 56.1 54 57.2 59.4
32 31.7 i 32.9 34.1 35.2 34 32;7 33.9 35.1 36.3 37.4 36 33.7 34.9 36.1 37.3 38.5 39.6
/
56 58.3 60.5 58 59.3 61.6 60 60.3 62.7 66.0
38 - 34.6 35.9 37.1 38.4 39.5 40.7 41.8 40 35.3 36.7 38.0 39.3 40.5 41.7 42.9 44.0 42 36.0 37.6 39.0 40.3 41.5 42.7 44.0 45.1 46.2
62 61.3 63.7 67.1 64. 62.2 64.7 68.2 66 63.2 65.7 69.3 72.6
44 36.9 38.5 39.9 41.2 42.5 43.7 44.9 46.1 47.2 48.4
68 64.1 66.6 70.3 73.7
46 37.8 39.3 40.8 42.2 43.5 44.8 46.0 47.2 48.4 49.5 50.6
70 65.0 67.6 71.3 74.8
48 . 38.5 40.0 - 41.5 43.0 44.4 45.6 46.9 48.1 49.3 50.5 51.6 52.8 72 65.9 68.5 72.3 75.9 79.2
50 39.2 40.8 42.3 43.8 45.2 46.5 47.9 49.1 50.4 51.6 52.9 54.0 74 66.8 69.4 73.3 76.9 80.3 52 40.0 41.6 43.1 44.7 46.1 47.5 48.9 50.1 51.3 52.5 53.8 55.0 76 67.6 70.3 74.2 77.9 81.4 54 40.7 42.4 44.0 45.5 47.0 48.4 49.9 51.1 52.3 53.5 54.8 56.0 78 68.4 71.2 75.2 78.9 82.5 85.8
, 56 ' 41.3 43.0 44.6 46.2 47.7 49.1 50.6 52.0 S3.3 S4.6 55.9 57.0 80 69.2 72.1 76.1 79.9 83.6 86.9
58
42.1 43,8 45.4 47.0 48.5 50.0 51.5 52.9 54.2 55.5 56.8 58.0
82
70.1 73.0 77.1 80.9 84.6 88.0
60 42.7 44.5 46.1 47.8 49.3 50.9 52.3 53.8 55.6 56.4 57.7 58.9 84 70.9 73.8 78.0 81.9 85.6 89.1 92.4
62 43.4 45.1 46.8 48.4 50.0 51.7 53.0 54.5 55.9 57.2 58.5 59.7 86 71.7 74.6 78.9 82.9 86.6 90.2 93.5
64 44.0 ' 45.8 47.3 49.2 50.9 52.4 53.9 55.4 56.8 58.1 59.4 60.6 88 72.5 75.5 79.8 83.9 87.5 91.2 94.6 96.8
66
44.7 46.5 48.2. 50.0 51.6 53.1 54.7 56.2 57.6 59.1 60.4 61.6
. -90
73.3 76.3 80.6 84.7 88.5 92.2 95.7 97.9
68 45.3 47.2 48.9 50.7 52.2 53.8 55.5 56.9 58.4 59.9 61.3 62.6 92 74.1 77:i 81.4 85.6 89.5 93.2 96.7 99.0 70 46.0 47.8 49.5 51.3 52.9 54.5 56.2 57.7 59.1 60.6 62.1 63.5 94 74.8 77.8 82.2 86.5 90.4 94.2 97.8 100.1 72 46.5 48.4 50.1' 51.9 53.7 55.4 57.0 58.7 60.0 61.3 63.0 64.5 96 75.5 78.7 83.0 87.4 91.3 95.2 98.8 101.2
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