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49.Vent stacks are used only to allow air to enter the system50.The fixture branch is the horizontal pipe running from the fixture trap to thevertical soil or waste stacks51.Hydraulic Grade is a line from the water level of a fixture such as the lavatory tothe branch connection at the soil stack.52.Individual vent is sometimes referred to as back vent. 53.It is that portion of the vent pipe which serves a single trap.
54.Individual vent is the most practical vent of trap which effectively prevents theminus or plus pressure of every fixture trap. 55.No vent should be less than 38mm (1 ½”) diameter except for a 32mm (1 ¼”)waste.56.All branch vent pipes should be free from drops or sags and should be so gradedand connected so as to drip back the soil or waste pipe by gravity.57.Circuit or Loop vent is employed where two or more fixture traps are installed ona horizontal soil or waste branch, generally reduces the cost of plumbinginstallation.58.Main vent – the principal artery of the venting system to which vent branches areconnected.59.Individual vent – is a pipe installed vents a fixture trap and which connects withthe vent system above the fixture, serve or terminate in the open air 60.Unit vent – an arrangement of venting or installed that one vent pipe will servetwo trap.61.Circuit or Loop vent – a group vent pipe which starts in front of the extremefixture connection on a horizontal branch or connects to the vent stack.62.Yoke vent – a pipe connecting upward from a soil or waste stack below the floorand below horizontal connection to an adjacent vent stack at a point above thefloor and higher than highest spill level of fixtures for preventing pressurechanges in the stack.