Document 2jy7Qg0aXO1qBYN10dJxN3B05

734 CHAPTER 32 .02 JOS 04 .06 08 J ; 1956 Guide 3 a 6 8 10 CU FT OF AIR PER MINUTE .01 .02 .03 04 06 08 .1 .2 3 .4 .6 .8 I 2 34 FRICTION LOSS IN INCHES OF WATER PER 100 FT Fig. 2. Friction of Air in Straight Ducts For Volumes of 10 to SOW cfm (Based on Standard Air of 0.075 lb per cu ft density Sowing through average, clean, round, galvanized metal duets having approximately 40 joints per 100 ft.} Caution: Do not extrapolate below chart. .02 .03 J04 .06 OQ J .2 .3 .4 .6 .8 I 2 34 6 FRICTION LOSS IN INCHES OF WATER PER 100 FT " Fig. 3. Friction of Air in Straight Ducts 8 10 For Volumes of 1000 to 100,000 cfm (Based on Standard Air of 0.075 lb per cu ft density flowing through average, clean, round, galvanized metal ducts having approximately 40 joints per 100 ft.) factors may be obtained from Fig. 4.3 Most ductwork today is fabricated from galvanized iron or aluminum sheet metal, or flexible tubing. Fig. 5 presents in graphical form the recommended correction factors for alumi num ductwork.4 The correct friction loss for ducts other than sheet metal