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What is the function of a vent stack in plumbing?

To carry sewage away

To provide drainage

To allow air to enter the system and prevent siphoning

The function of a vent stack in plumbing is primarily to allow air to enter the drainage system, which can prevent the siphoning of water from traps. Vent stacks play a crucial role in maintaining atmospheric pressure within the pipes; without proper venting, negative pressure can build up when water flows through the system. This negative pressure can lead to traps being drained and potentially allowing sewer gases to enter the living spaces, which is a significant health hazard. By ensuring that the plumbing system can breathe properly, the vent stack supports the overall efficiency and safety of the drainage system, allowing for effective and uninterrupted flow of waste while protecting against siphoning issues.

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To facilitate hot water flow

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