Document MJzDoKMoer499kN7m4z4eNqy
HEATING VENTILATING AIR CONDITIONING GUIDE 1943
I
612 , . 6 1 3-
Table- 1. Circular Equivalents of Rectangular Ducts for Equal Friction0--(Continued)
SlDB
Rectangular
4
5
6
7
8
9 ' .10 11 , 12 13 14 . 15 16 17
-Duct
8 9 10 11
12 13
14 IS
16 17 18 19
20 22 24 26
28 30 32 34
`36 38 40 42
1 ' 44 46 48 50
.52 54 56 . 58
60 \ 62
' 64 66
6.1 6.5 ` 6.8 7.1
6.9 7.6. 7.3' . 8.0
7.7 8.4 . s;o 8.8
8.2; 8.7 9.2 9.6
8.8 9.3 9.8 10.2
9.9 . 10.4'
10.9
11.0 11.5
12.1
7.4 8.3 9.2 10.0 10.7 . 11.4 12.0 12.6 \2.2 7.6 8.7 9.6 10.4 11.1 11.8 ' 12.5 13.1 13.7 7.9 8.9 . 9.9 10.8 11.5. 12.3 12.9 13.6 14.3 8.2 9.2 10.2 11.1 11.9 12.7 '. 13.4 14.1 14.7
8.4 9.5 10.5 11.4 12^3* 13. i 13.8 14.5 15.2 8:6 9.8 10.8 11.8 12.6 13.5 14.2 15:0 15.7 8.9 10.0 11.1 12.1 13.0 13.8 14.6 15.4 16.1 9.1 10.3 .11.4 12.4. 13.3 14.2 15.0 15.8 16.5
9.3 9.7 10.0 10.4.
10.5 11.0 11.4 11.8
11.6 12.1 12.6 13.1
12.7 13.2 13.8 14.3
13.6 14.2 14.8 15.4
14.5 15.2 15.8 16.4
15.4 16.1 16.8 17.3
16.2 16.9 17.6 18.3
17.0 17.8
18.5 19.2
10.8 11.0 I i .3 11.6
12.2 12.6 12.9 . 13.2
13.5 13.9 14.3 14.7
14.8 15.2 1316 . 16.1.
15.9 16.4 16.9 17.3
17.0 17.5 18.0 18.5
18.0. 18.5 .19.1
. 19.6
19.0 19.5 20.1 20.7
19.8 20.5 21.1
21.6
11.9 12.2 12.5
12.7
13.6 13.9 14.3 14.5
15.1 15.4 15.7 16.1
16.4 16.8 17.2` 17.6
17.7 18.2 18.6 19.0
19.0 19.4 19.8 20.3
20.1 20.6 . 21.1
. 21.6
21.2 21.7 22.2 22.7
22.2 22.8 23.3
23,8
13.0 15.3 13.5 13.7
14.8 15.1 15.4 15.7
16.4 16.7 17.0 17.3
16.0 18.4 18.7. 19.0
19.4 19.8 20.1 20.4
20.7 21.1
21.5 21.9
22.0 .22.4
22.8 ` 23.2
23.1 23.6 24.1
24.5
24.3 24.8 25.2 25.7
13.9 14.1 14.3 14.6
15.9 16.1 16.3 16.6
17.6 17.9 18.2 18.4
19.2 19.6 19.9 20.2
20.S 21.1 21.5 21.8
22.2 22.6 22.9 23.3
23.6 , 24.0 24.4
24.7
24.9 25.3 25.7 26.1
26.2 26.6 27.0 27.4
14.7 15.0 15.1 15.3
16.8
17.0
17.3 .,7,;
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
25.1 25.5 .'25.9 26.2
26.5 26.9 27.3 27.7
27.8 28.2 28.6 , 29.0
14.3 14.9 15.3
15.4 16.0
16.5
,-
15.8 16.3 16.8 17.2
16.5 17.0 17.4 17.9
17.1 17.6 18.1 18.6
' 17.6
18.2 18.7 19.2
17.6 18.5 19.3 20.0
18.4 19.2 20.0 20.8
19.0 19.9 20.8 21*.6
19.7 20.6 21.5 22.3
20.7 21.4 22.0 22.6
21.5 22.2 22.9 23.5
22.4 23.1 23.8 24.4
23.1 23.9 24.6 25.3
23.2 23.8 24.4 24.9
25.4 25.9 26.4 26.9
24.224.8 25.4
25.9
25.1 25.8 26.4
26.9
26.5 27:0 27.5 28,0
' 27.5
28.1 28.6 29.2
26.0 26.7 27.3 27.9
28.5 29.1 29.6 30.3
27.4 27.8 28.3 28.7
28.5 29.0 29.5 30.0'
29.6 30.1 30.6 31.1
30.7 31.2 31.7 32.2
29.1 29.5 29.9 30.3
30.5 30.9 31.3 31.7
31.6 32.1 32.6 33.0
32.7 33.233.7 34.2
Additional sizes: 4 X 5 - 4.9; 4 X 8 - 6.4; 4 X 7 - 6.8; 6 X 6 - 5.5; 5 X 6 - 8.3; 5X7 = 8.5.
18.7 19.2 19.8
20.3 21.3 22.2 23.0
23.9 24.7 25.4 .26.2
26.8 27.5 28.2 28.8
29.5 30.1 30.5 31.3
31.8 32.3 32.8 33.3
33.8 34.3 34.8 35.3 .
18 19 20 21
19.8 20.4
20.9
20.9 21.9 22.8 23.8
21.5 22.-5 23a 5 24.4
22.0 23.1 24.0 25.1
23.6 24.7 25.7
24.6 25.4 26.2 26.9
.25.3 26.2 27.0
27.7
26.0 26.8 27.7 28.5
26.6 27.5 28.4
29:2
27.7 28.4 29.1
29.8
28.5 29.2 29.9 . 30.7
29.3 30.0 30.8 31.4
30.0 30.8 31.6 32.2
30.3 31.0 31.6 32.2
31.2 31.9 32.5 . 33.1.
32.1 32.8 33.4 34.1
32.9 33.8 34.3 35.0
32.9 33.4 33.9 34.4
33.8 34.4 34.9 35.4
34.7 35.3 35.9 36.4
35.6 .36.3 36.9 37.4
34.9 35.4
35.9 36.4
36.1 36.6 37.1 37.6
37.1 37.7 38.2 38.7
38.1 38.7 39.2 39.8
22 24
24.2 25.2 26.3
26.4 27.S
27.3 28.2 29.1 30.0'
28.5 29.5 30.5 31.3
30.8 31.5 32.4
33.0
32.2 33.1 33.9 34.5
33.7 34.6 35.2 35.9
35.3 36.2 37.0 37.6
36.5 37.2 37.8 38.4
38.3 38.9 39.6 40.3
39.1 39.6 40.2 40.8
40.9 41.6 42.2 42.8
CHAPTER 32. AIR DUCT" DESIGN
Table 1; Circular Equivalents of Rectangular Ducts for Equal Friction--(Concluded)
SlDB
- 6idb
~'
Rectangular
26
28 '30
32
34 f, 36
.38
40 ' 42'
44
46
48 Rectangular 50
54- 60
66
72
78 84
88
Duct ..
Duct
26 28.6 28 29.7 30 . 30.7
32* : 34'' " 36
' 31.7
32.7 33.7
30.8 31.9 . 33.0
\ .,
32.9' 33.9 34.9
34.1 35.2 35.1. 36.3 36.1 . 37.3
37.4 38.5
39.6
..
50 55.0 52 56.1 54' 57.2 59.4
.i
'.56
58.3 60.5
58 59.3, 61.6
60? 60.3 62.7 66.0
38,. 40 42
34.6 35.9 35.3 36.7 36.0 : 37.6-
37.1 38.0 39.0
38.4 39.3 40.3
39.5' 40.7 40.5. 41.7 41.5 . 42.7
41.8 42.9 44.0
`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 4L.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 66.6 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 58 60
62 `
64 %
: 41.3 42.1
. 42.7
4$.0 43.8 44.5;
44'6 45.4 .46.1
43.4 45.1 44.0 45.8 44.'7 46.5
46.8 47.5 48.2
68 ' ' 45.3 ' 47.2 48.9
70 46.0 47.8 49.5
72. ;
46.5 48.4- 50.1
46.2 47.0 47.8
47.7 *, 49.1 48.5. 50.0 49.3 50:9
50.6 51.5 52.3
52.0 52.9 53.8
'53.3 54.2 55.0
54.6, 55.9' 55.5 .56.8 56.4 ,57.7-
57.0 58.0. 58.9
80 ' 82
84
48.4 49.2 50.0
50.0 50i9 51.6
50.7 51.3 51.9
52.2 52.9 .53.7
51.7 52.4 53.1
53.0 53.9 54.7
54.5 55.4 56.2
.55.9 56.8 57,6
`57.2 58.1 '59.1
58.5 59.4 60.4.
59.7 60.6 61.6
86 .88 '90
53.8 54.5 55.4
55^5
56.2 57.0
56.9 -57.7 58.7
58.4 ; 59.1 60.0.
59.9 60.6 61.3
61.3 62.1 63.0
62.6 63.5 64.5
-.
: 92: . 94
96
69.2 .70.1
70.9
72.1 73.0 73.8
76.1 77.1 78.0
79.9 80.9 81.9
83.6 84.6 85.6
86.9 88.0 89.1
92.4
71.7 72.5 73.3
74.6 75.5 76.3
78.9 79.8. 80.6
82.9 83.9 84.7
86.6 87.5 88.5
90.2 91.2 92.2
93.5 94.6 95.7
96.8 97.9
74.1 .74.8 75.5
77.1 77.8 78.7
81.4 82.2 83.0
85.6 86.5 87.4
89.5 90.4 91.3
93.2 94.2 95.2
96.7 97.8 98.8
99.0 100.1 101.2
V -