Which pipe material is commonly used for condensation drainage due to its resistance to corrosion and ease of installation?

• A. Copper
• B. Polyvinyl chloride (PVC)
• C. ABS
• D. CPVC

Answer: (B)

Condensation drainage lines need a material that won’t corrode in humid, slightly acidic condensate and that can be joined easily. PVC fits that need well because it won’t rust or corrode in these conditions and can be installed quickly with solvent-weld joints—no threading or soldering required. Its smooth interior helps prevent buildup and clogs, which is important for gravity-fed condensate drainage. Copper, while strong, is heavier and requires soldering; it can also be affected by acidic condensate and galvanic interaction with other metals. ABS is another plastic, but PVC is more universally used for condensate drains, and CPVC is more costly and typically reserved for hotter water lines.