Which of the following is a potential safety concern with improper ventilation?

Improper ventilation can lead to heat build-up as one of its primary safety concerns. When ventilation systems are not functioning correctly, they cannot effectively remove excess heat generated by appliances, equipment, or even occupants within a space. This stagnant heat can accumulate, raising indoor temperatures to uncomfortable or even hazardous levels, which not only decreases comfort but can also encourage overheating of equipment or lead to heat-related illnesses in occupants.

In contrast, moisture accumulation is related to issues within the ventilation system, such as a lack of fresh air circulation, which can cause problems like mold growth. Inadequate lighting pertains to levels of illumination and does not directly relate to ventilation concerns. Circuit overload is more about electrical systems, which may not necessarily be influenced by ventilation practices. Understanding the risks associated with heat build-up emphasizes the importance of properly designed and maintained ventilation systems in ensuring both comfort and safety in buildings.