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Ducts - Diameters and Cross-Sectional Areas

Circular ducts and cross-sectional areas

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circular duct

Circular ventilation ducts and cross-sectional areas:

Duct Diameter Area
(in)(mm)(ft2)(m2)
8 203 0.3491 0.032
10 254 0.5454 0.051
12 305 0.7854 0.073
14 356 1.069 0.099
16 406 1.396 0.130
18 457 1.767 0.164
20 508 2.182 0.203
22 559 2.640 0.245
24 609 3.142 0.292
26 660 3.687 0.342
28 711 4.276 0.397
30 762 4.900 0.455
32 813 5.585 0.519
34 864 6.305 0.586
36 914 7.069 0.657
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