Question about Elements of Design 1/2 Inlet Copper Pipe Application, 2 Shut Off Ball Valve

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Vent Pipe Question

Is an open vent pipe still required?

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In the majority of buildings, yes - it depends on the type of building and the building regulations. The purpose of the open vent pipe is to relieve any positive pressure in the drainage system. In buildings up to ten storeys high, one open vent is recommended to relieve the constant positive pressure build-up that can occur if the main sewer is blocked for some time. In higher buildings the positive pressure generated is in transient form, so each stack would need an open vent.

Posted on Aug 27, 2008

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