Document 3a5emYn1Vop2LMep70na6ymJ

HEATING' VENTILATING AIR CONDITIONING GUIDE 1940 sheet Fig. 7. Details op Seams Heating Unit . l' Fig. 9. Installation of Easement in Duct Around Obstruction 558 CHAPTER 30. AIR DUCT DESIGN Table 4. Sheet Metal Gages for Rectangular Duct Construction3 Gash Width or Duct SSAH Runtobckd Scam 26 24 . 22 22 20 Up to 12 in. 13 in. to 30 in. 31 in. to 48 in. 49 in. to 60 in. 61 in. to 90 in, . 1 1 ih 14 in. x 1% in. ih H in. x 1% in. alf panels are not cross-broken two gages heavier material should be used. Table 5. Weights of Sheet Metal Used for Duct Construction U. S. Std. Gaqb 30 28 26 24 22 20 18 16 14 12 10 Appsoximate Thickness In. 0.0120 0.0149 0.0179 0.0239 0.0299 0.0359 0.0478 0.0598 0.0749 0.1046 0.1345 Sheet Steel Weight per Square Foot Ounces 8 10 12 16 20 24 32 40 50 70 90 Pounds 0.5000 0.6250 0.7500 1.0000 1.2500 1.5000 2.0000 2.5000 3.1250 4.3750 5.6250 Galvanized Iron Weight per Square Foot Ounces 10.5 12.5 14.5 18.5 22.5 26.5 34.5 42.5 52.5 72.5 92.5 Pounds 0.656 0.781 0.906 1.156 1.406 1.656 2.156 2.656 3.281 4.531 5.781 Table 6. Weights and Thicknesses of Standard Coffer Sheets3 Rolled to Weight Weight per Square Foot Ounces Pounds Thickness, Inches Decimal Equivalent Nearest Fraction 10 0.625 0.0135 Hi 12 0.750 0.0162 %4 14 0.875 0.0189 Hi 16 1.000 0.0216 H2 H18 1.125 0.0243 2 20 1.250 0.0270 Hz 24 1.500 0.0324 Hz H28 1.750 0.0378 2 32 2.000 0.0432 Hi 36 2.250 0.0486 Hi 40 2.500 0.0540 Hi 44 2.750 0.0594 M.6 He48 3.000 0.0648 56 3-500 0.0756 Hi 64 4.000 0.0864 Hi Variations from these weights must be expected in practice. 559 Nearest Gage No. B. & S. Stubs 27 29 26 27 25 26 23 24 22 23 21 22 20 21 19 20 17 19 16 18 15 17 15 17 14 16 13 15 11 14