Quiz: 2024 International Residential Code (IRC) Chapter 31 Vents

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1. What is the maximum pressure differential allowed for the liquid seal of any fixture trap within a plumbing system?

0.5 inch of water column (124.5 Pa)
1 inch of water column (249 Pa)
1.5 inches of water column (373.5 Pa)
2 inches of water column (498 Pa)

2. In climates where the 97.5-percent outside design temperature is 0°F (-18°C) or less, how must vent pipes installed on the exterior of a structure be protected?

They must be protected by insulation only.
They must be protected by heat only.
They must be protected by insulation, heat, or both.
They are not required to be protected, only vent terminals.

3. Which of the following statements is true regarding the required vent system for each building drain?

It must have at least one vent pipe that connects to an island fixture vent.
It must have at least one dry vent pipe that extends to the outdoors.
It must have at least one vent pipe that connects to a wet vent system.
It must have at least one vent pipe that terminates indoors with an air admittance valve.

4. An open vent pipe that extends through a roof, and is not covered or on a recreational roof, must terminate how high above the roof?

Not less than 2 inches (51 mm) above the roof.
Not less than 6 inches (150 mm) above the roof or anticipated snow accumulation, whichever is greater.
Not less than 7 feet (2134 mm) above the roof.
Not less than 12 inches (305 mm) above the roof.

5. For a roof used as an observation deck, what is the minimum termination height for open vent pipes?

6 inches (150 mm) above the roof.
2 feet (610 mm) above the roof.
4 feet (1219 mm) above the roof.
7 feet (2134 mm) above the roof.

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