Document ZnmqbxDq20EbXgkbLz0vVLwVd

CU FT OF AIR PER MINUTE FRICTION OF AIR IN STRAIGHT DUCTS HEATING VENTILATING AIR CONDITIONING GUIDE 1950 COPYRIGHT 1950 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.