What is referred to as a branch vent?

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A branch vent is defined as a duct that carries air from a fixture or a group of fixtures to the vent stack. It is specifically designed to ensure that there is adequate airflow to maintain the proper function of a plumbing system by preventing the creation of a vacuum, which can impede the drainage process. By connecting a fixture to the vent stack, the branch vent allows for the escape of sewer gases and helps to maintain pressure balance in the system. This connection is crucial in allowing wastewater to flow smoothly while preventing potential back-pressure and blockage.

In contrast, the main vent for a stack involves the primary air release component for an entire vertical stack, while the venting for an entire building refers to the overarching system that integrates all venting measures within that structure. A dedicated air source for pumps does not pertain to venting systems but rather to a different essential service in plumbing and hydraulic systems.

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