When discharging to a stack, WC pans must be vented.
a minimum diameter of 80 mm where they are also acting as a drain vent pipe, or.Vent pipes must have a minimum diameter as given in G13/AS1:Table 6 Vent pipe sizes. terminate no less than 50 mm above the overflow level of the highest fixture that it serves.have a continual rise from the point of connection with the discharge pipe to the open air.That said they do serve an important purpose and can help waste drain more properly. Personally I dont like them and I rarely see an instance where you couldnt have just run a proper vent pipe. Now occasionally they do fail/stick and let sewer gas out or if you have a clog will leak some. access to a pipe is otherwise restricted.Īll discharge pipes must be vented in accordance with G13/AS1:Table 5 Venting requirements.Ī vent pipe may be connected to a relief vent, a discharge stack vent, or a branch vent. An air admittance valve is just that, it admits air, it isnt supposed to let air or water out.there are bends and/or junctions likely to cause a blockage.a soil discharge pipe connects to a stack.
Access points must be provided so that blockages can be cleared where: