Document 93L8wBQ74aknOxVVnv7B3wpN5

esa CU FT OF AIR PER MINUTE FRICTION LOSS IN INCHES OF WATER PER IOO FT FRICTION OF AIR IN STRAIGHT DUCTS HEATING VENTILATING AIR CONDITIONING GUIDE COPYRIGHT 1951 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. NO SAFETY FACTOR INCLUDED. CAUTION: DO NOT EXTRAPOLATE BELOW CHART. . 1 T