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Figure 8-20.-Two fixture units sharing a common vent.

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by the last fixture tend to scour the vents of other fixtures on the line. When liquid wastes flow through a portion of a vent pipe, the pipe is known as a WET VENT. A  LOOP  VENT  is  the  same,  except  that  it connects into the stack unit to form a loop. This type may be used on a small group of bathroom fixtures,  such  as  a  lavatory,  water  closet,  and shower, as shown in figure 8-22. The pipe for a wet vent installation should be sized to take care of  the  lavatory,  water  closet,  and  shower. NOTE:  The  pipe  for  a  wet  vent  installation Figure 8-20.-Two fixture units sharing a common vent. A  COMMON  VENT  vents  two  traps  to  a single vent pipe, as shown in figure 8-20. The unit vent  can  be  used  when  a  pair  of  lavatories  is installed side by side, as well as when they are hung  back  to  back  on  either  side  of  a  partition (as shown in the figure). A point to note is that the  waste  from  both  fixtures  discharges  into  a double sanitary tee. A CIRCUIT VENT serves a group of fixtures. As  shown  in  figure  8-21,  a  circuit  vent  extends from   the   main   vent   to   a   position   on   the horizontal  branch  between  the  last  two  fixture connections. If more than eight fixtures are to be vented, an additional circuit vent is to be installed. In this type of vent, water and waste discharged Figure 8-21.-Use of a circuit vent. should never be under 2 in. in diameter when it will be draining more than four fixture units. A water  closet  should  not  drain  into  a  wet  vent. As shown in figure 8-22, the lavatory should be  individually  vented.  This  is  necessary  to prevent  loss  of  the  trap  seal  through  indirect siphonage.  Another  point  to  note  is  that  the relatively clean water discharged from the lavatory will  tend  to  scour  the  wet  vent,  preventing  an excessive buildup of waste material in the vent. Materials  used  in  vent  piping  ordinarily include galvanized pipe, cast-iron soil pipe, and, at  times,  brass,  copper,  and  plastic  piping. In all phases of the venting system, it is best to  use  proper-sized  piping.  Remember  that  the diameter of the vent stack or main vent must be no  less  than  2  in.  The  actual  diameter  depends on the developed length of the vent stack and on the number of fixture units installed on the soil or  waste  stack.  The  diameter  of  a  vent  stack should be at least as large as that of the soil or waste stack. Figure 8-22.-Use of a wet vent. 8-16



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