Page 40 - NAS Catalog 2019
P. 40
Formulas & Weights
Metal Gauges and Weights Commonly Used Formulas
Gauge Galv lbs/sqft Alum lbs/sqft CFM = Duct velocity (FPM) x Area (sq ft)
4 0.2043 KW = BTU x 3413
KW = CFM x TL-TE / 3160
5 0.1819 2.56 BTU = CFM x TL-TE x 1.08
6 0.1620 2.28
TL = Leaving Air Temperature
7 0.1443 2.03 TE = Entering Air Temperature
8 0.1681 7.0312 0.1285 1.81
9 0.1532 6.4062 0.1144 1.61
10 0.1382 5.7812 0.1019 1.44
11 0.1233 5.5162 0.0907 1.28
12 0.1084 4.5312 0.0808 1.14
13 0.0934 3.9062 0.0720 1.01
14 0.0785 3.2812 0.0641 0.903
15 0.071 2.9687 0.0571 0.804
16 0.0635 2.6562 0.0508 0.716
17 0.0575 2.4062 0.0453 0.638
18 0.0516 2.1562 0.0403 0.568
19 0.0456 1.9062 0.0359 0.506
20 0.0396 1.6562 0.0320 0.450
21 0.0366 1.5312 0.0285 0.401
22 0.0336 1.4062 0.0253 0.357
23 0.0306 1.2812 0.0226 0.318
24 0.0276 1.1562 0.0201 0.283
25 0.0247 1.0312 0.0179 0.252
26 0.0217 0.9062 0.0159 0.225
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