Which of the following is a potential risk with UFAD systems?

The concern with water entering an Underfloor Air Distribution (UFAD) system and causing a short circuit is valid due to the nature of how UFAD systems operate. These systems use the space beneath the raised floor to distribute conditioned air directly to occupied spaces. If there's a failure in the system, such as water intrusion from a leak or flooding, it can compromise electrical components that are integral to the system's operation. Water and electricity do not mix; any moisture can lead to short circuits, resulting in system failures, potential hazards, and safety risks in occupied spaces. This further emphasizes the importance of regular inspection and maintenance of UFAD systems to ensure their integrity and operational safety.

While excessive duct pressure, reduced airflow efficiency, and overheating of air ducts are all significant concerns in various HVAC systems, they do not specifically highlight the unique vulnerabilities of UFAD systems regarding water intrusion and its effects.