Question 1

The diameter of a relief vent serving stacks of more than 10-branch intervals shall be AT LEAST 2 inches.

A relief vent must have a minimum diameter of 2 inches when serving stacks with more than 10-branch intervals to ensure proper ventilation and prevent pressure build-up.

A) 1/2 the diameter of the soil or waste branch to which it is connected

This option is incorrect because it does not specify a minimum absolute size for the vent diameter. The requirement is for the vent to be at least 2 inches, regardless of the size of the connected soil or waste branch.

B) 1 1/2 inches

This option is also incorrect since it is below the required minimum diameter. A relief vent serving stacks of more than 10-branch intervals must be at least 2 inches, making 1 1/2 inches insufficient for adequate ventilation.

C) 2 inches

This option is correct as it meets the specified minimum diameter for a relief vent serving stacks of more than 10-branch intervals. It ensures effective ventilation and compliance with relevant standards.

D) equal to the diameter of the vent stack to which it is connected

This option is incorrect because it lacks specificity regarding a minimum size. While the vent diameter can be equal to that of the vent stack, it does not provide a guaranteed minimum size, which is necessary for stacks with more than 10-branch intervals.

Conclusion

The correct answer is 2 inches, as it aligns with the established requirements for relief vent diameters in specific applications. All other options fail to meet the necessary criteria, either by being too vague or not providing a sufficient minimum diameter, which is crucial for effective stack ventilation in plumbing systems.