NCIDQ IDFX Practice Exam

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What type of stack deals specifically with human waste?

Vent stack
Waste stack
Soil stack
Drain stack

The correct answer is: Soil stack

The correct choice is soil stack, as it specifically deals with the transportation of human waste and wastewater from fixtures such as toilets. A soil stack is integral to a building's plumbing system and is usually the vertical pipe that carries waste from restrooms down to the building's drainage system, often leading to a sewer line or septic tank. In contrast, other types of stacks serve different purposes. For example, a vent stack is primarily designed to allow air to enter the plumbing system, maintaining atmospheric pressure and preventing siphoning of traps. A waste stack, while it handles wastewater from fixtures like sinks and showers, does not predominantly deal with human waste. A drain stack is typically involved in the collection of stormwater or greywater but is not specifically for human waste. Understanding these distinctions helps to clarify the roles of each type of stack in plumbing systems.