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.American Society of Heating and Ventilating Engineers Guide, 1932 aO N U (A X4I38dB3 '1U33 J3J 458 ^ fO O D iam eter o f B ranch Pipe F ig . 4. M a in an d .B ranch Pipes for E qual F rictio n per F oot of L ength (1 to 20 Per Ce n t C apacity). - . ; D iam eter o f B ranch Pipe (20 to 100 Per C ent Capacity) Chapter 32--Air Distribution Systems 459