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HEATINC VENTILATINC AIR CONDITIONING GUIDE 1941 578 579 T able 1. Circular Equivalents op Rectangular D ucts for Equal Friction6--(Continued) - -Additional B lz e j: 1 X 1 = 4.9; 4 X 6 S.4; 4 X 7 = 8.8; 8 X 8 8.8; 8 X 6 = 6.3; 8 X 7 T able 1. Circular Equivalents o f Rectangular D u c ts For Equal F riction-- (Concluded) CHAPTER 31. AIR DUCT DESIGN