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 10121416
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=100CFM.1in.wcX5=500CFM
8”pipe=240CFM.1in.wcX2=480CFM.
Square inches adjusted to match sizes with Table 1 — Branch values.
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