What is the purpose of a vent stack in plumbing?

The primary function of a vent stack in plumbing is to release sewer gases. By allowing these gases to escape, vent stacks help maintain proper air pressure within the plumbing system, which is essential for the effective flow of water and waste. When proper ventilation is not in place, negative pressure can create problems such as slow drainage and the potential for sewer gases to enter living spaces, leading to health hazards and unpleasant odors.

In addition to venting gases, vent stacks also play a crucial role in maintaining the water traps in fixtures, preventing the siphoning of water that can lead to sewer gas leakage into homes. It is important to ensure that the venting system is properly installed and maintained to ensure effective operation.