Master Plumber Practice Exam

The correct choice is galvanized sheet steel because this material meets the specifications required for single-wall metal piping systems, particularly in terms of thickness and durability. Galvanized sheet steel is commonly used for exhaust and ventilation systems due to its ability to resist corrosion from moisture and other environmental factors, which is essential for maintaining system integrity.

The requirement for a thickness of not less than 0.0304 inch helps ensure that the material can withstand the pressures and potentially harsh conditions often encountered in plumbing applications. Galvanized sheet steel strikes a balance between strength, weight, and corrosion resistance, making it a suitable choice for these types of applications.

Other materials like PVC Sch 40, copper sheet metal, and cast iron do not align with the parameters set for single-wall metal piping. PVC, for example, is a plastic and does not meet metal pipe requirements, while copper typically has different thickness standards and is often more expensive and less commonly used for certain applications. Cast iron, while very durable, is primarily utilized for different types of plumbing systems and typically isn’t manufactured in the thin dimensions specified by this requirement. Thus, galvanized sheet steel is the appropriate choice for this question.