TABLE 2A-MAIN DUCT SIZING
EQUIVALENT AREAS FOR DUCTS (SQ. IN.)
Duct Height
Round
Duct Width
8(in.)
10(in.)
Dia-in.
Sq-in.
8
60
80
8
50
10
80
87
10
79
12
90
110
12
113
14
105
135
14
154
16
115
157
16
201
18
125
167
18
269
20
145
190
20
314
22
155
210
22
380
24
165
215
26
227
28
241
30
254
32
269
34
284
36
299
38
314
40
330
42
346
44
363
TABLE 2B-BRANCH DUCT AREA (SQ. IN.)
DUCT DIAMETER - IN.
Quantity
5
6
7
8
10
12
14
16
1
20
28
38
50
79
113
154
201
2
40
56
76
135*
180
365
565
760
3
60
84
114
180
330
530
795
825
4
80
112
152
235
465
730
825
5
100
140
190
300
530
825
6
120
168
228
365
660
7
140
196
266
430
760
8
160
224
304
500
825
9
180
252
342
565
10
200
280
380
630
11
220
308
418
660
12
240
336
456
726
13
260
364
494
795
14
280
392
532
15
300
420
570
Two 8” pipes have approximately the same volume of five 6” pipes. To keep static approximately .1 in. wc, the numbers were adjusted to handle same CFM .1 in. wc.
Example:
6” pipe = 100 CFM .1 in. wc X 5 = 500 CFM
8” pipe = 240 CFM .1 in. wc X 2 = 480 CFM.
Square inches adjusted to match sizes with Table 1 — Branch values.
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