NCIDQ Interior Design Professional Exam (IDPX) Practice Exam

Question: 1 / 400

What is the purpose of a plumbing trap?

Prevents waste from the sewage system from backing up into the building

Allows built up sewage gases to escape to the outside

To prevent gases from the sewage system from entering the building

The primary purpose of a plumbing trap is to prevent gases from the sewage system from entering the building. A plumbing trap holds a small amount of water, which creates a barrier that stops foul-smelling gases and potentially harmful odors from the wastewater system from seeping back into the interior space. This is crucial for maintaining indoor air quality and ensures a healthier living environment.

While other functions related to plumbing traps might be discussed, such as the role of venting in sewage systems or the maintenance of drainage flow, the main function is indeed this gas barrier. The trap effectively seals off the connection to the sewer line when not in use, thereby helping to prevent an unpleasant and potentially hazardous situation within the building.

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Allows pressure in the system to equalize

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