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Fig. 1. Friction of Air in Pipes
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Friction in Inches of Waterper 100 Ft.
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6.9 7.6 7.3 9.0
. 7.7 8.4
8.0 8.8
.8 .3 9 .2
i.V
9.6 9.9
9 .2 j 10.2
9.5 10.5 9.8 10.8
10.0 11.1 10?3 11.4
10.5 1 11.0
11.4 : 11.8
11.6 12.1
12.6 13.1
j 12.2 . 13.5 1 12.6 13.9
12.9 14.3 13.2 14.7
13.6 13.9 14.3 14.5
15.1 15.4 15.7 16.1
14.8 1 16.4 15.1 16.7
15.4 : 17,0 15.7 17.3
18.7 19.0 19.2
19.5
8.2
8.7
699
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10.0 10.4 10.8 11.1
8.8 9.3 9.8 10.2
l1ir0..7 :
11.5 11.9
9.9 10.4 10.9
11.4 11.8 12.3 12.7
11.0 . 11.5 12.1
12.0 12.6 12.5 13.1 12.9 13.6 13.4 14.1
13.2 13.7 14.3
14.7 '
14.3 14.9 15.3
IS . 4
16.0
. 8
28
11.4 12.3 . 13.1 13.8 14.5 15.2 15.8 16.5 17.1 17.6 11.8 12.6 13.5 14.2 15.0 15.7 16.3 17.0 17.6 18.2 18.7 12.1 13.0 13.8 14.6 15.4 16.1 16.8 17.4 18.1 18.7 19.2 12.4 13.3 14.2 15.0 15.8 16.5 17.2 17.9 18.6 19.2 19.8
12.7 13.6 14.5 15.4 16.2 17.0 17.6 18.4 19.0 19.7 20.3 20.9 21.5 22.0 13.2 14.2 15.2 16.1 16.9 1 17.8 18.5 19.2 19.9 20.6 21.3 21.9 22.5 23.1 23.6 24.2 13.8 14.8 15.8 16.8 17.6 ! 18.5 19.3 20.0 20.8 21.5 22.2 22.8 23.5 24.0 24.7 25.2 25.9 26.4 14.3 15.4 16.4 17.3 18.3 19.2 20.0 20.8 21.6 22.3 23.0 23.8 24.4 25.1 25.7 26.3 26.9 27.5
14.8 IS .9 17.0 18.0 19.0 ! 19.8 20.7
15.2 16.4 17.5 18.5 19.5 20.5 21.4
15.6 16. 9 . 18.0 19.1 20.1 21.1 22.0
16.1 17.3 18.5 19.6 20.7 2 1 .6 22.6 .
22.4 ! 23.1
23.8 24.4
23.1 23.9 23.9 ! 24.7 24.6 25.4 25.3 26.2
25.3 i 26.0 26.2 ! 26.8
27.0 27.7 27.7 28.5
26.6 .
27.5 28.4 29.2
27.3 ! 27.9 28.2 28.8 29.1 29.8
30.0 30.7
28.5
29.5 30.5 31.3
saasi
16.4 19.0 20.1 21.2 22.2 . 23.2 24.2 25.1 26.0 26.8 27.* 29.3 30.0 30.8 31.5 32.2 16.8 19.4 20.6 21.7 22.8 23.8 24.8 25.8 26.7 27.5 1 28.4 30.0 30.8 31.5 32.3 33.1 17.2 19.8 21.1 22.2 23.3 24.4 25.4 ' 26.4 27.3 28.2 29.1 30.8 3 1 .6 32.4 33.1 3 3 .9 17.6 20.3 2 1 .6 22.7 23.8 24.9 25.9 26.9 27.9 28.8 29.1 31.4 3 2 .2 3 3 .0 33.8 34.5
18.0 19.4 20.7 . 22.0 23.1 24.3 25.4 26.5 27.5 28.5 29.5 30.3 31.2 32.1 , 32.9 ; 33.7 34.5 ' 35.3
18.4 1 19.8 21.1 22.4 23.6 24.8 25.9 27.0
29.1 30.1 i 31.0 31.9 32.8 33.8 34.6 35.4 , 36.2
18.7 20.1 21.5 22.8 24.1 25.2 26.4 27.5
29.6 30.5 i 31.6 32.5 33.4 34.3 i 35.2 36.1 | 37.0
19.0 j 20.4 21.9 23.2 24.5 25.7 26.9 28.0 29.2 30.3 31.3 1 32.2 33.1 34.1 35.0 35.9 36.8 1 37.6
19.2 1 20.8 22.2 23.6 1 24.9
19.6 21.1 22.6 24.0 25.3
19.9 i 21.5
1 24.4 , 25.7
l
20.2 21.8 23.3 24.7 26.1
26.2 27.4 28.5 29.6 30.7 31.8 26.6 27.8 29.0 30.1 31.2 32.3 27.0 l 28.3 l 29.5 1 30.6 l 31.7 l 32.8 . 27.4 28.7 ! 30.0 31.1 32.2 33.3
i 33.8 34.7 35.6 34.4 35.3 36.3
1 34.9 1 35.9 1 36.9 35.4 36.4 37.4
37.4 38.3
38.0 38.9
l 38.7 1 39. 6 '
39.4 40.3
1
20.4
22.1
i
23.6 25.1
26.5
27.8 ! 29.1
30.5
31.6
32.7
33.8
20.7 22.4 1 24.0 25.5 26.9 28.2 29.S j 30.9 32.1 33.2 34.3
21.0 22.7 24.3 25.9 27.3 : 28.6 29.9 31.3 32.6 33.7 34.8
21.2 23.0 24.6 26.2 27.7 29.0 30.3 31.7 33.0 34.2 35.3
36.1 37.1 36.6 | 37.7 37.1 38.2 37.6 38.7
38.1 38.7 39.2
39.8
40.0 40.9 40.6 41.6 41.2 42.2 41.8 42.8
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Chapter XXVIII--Air Duct Design and Construction
American Society of Heating and Ventilating Engineers Guide, 1929