What is the primary purpose of a plumbing vent system in a drainage, waste, and vent (DWV) installation?
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A
To provide a direct path for sewer gas to escape the building.
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B
To equalize atmospheric pressure within the drainage system, protecting trap seals.
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C
To increase the velocity of wastewater flowing through the pipes.
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D
To serve as an overflow for the drainage system in case of a blockage.