In which of the following scenarios are space-heating systems not required?

Space-heating systems are typically not required in certain occupancy classifications that involve low occupancy loads or specific types of activities that do not necessitate temperature control for human comfort. Group F and H occupancies, which include factory and hazardous locations, are often characterized by conditions where heating systems may not be mandated due to the nature of their activities and potential safety concerns.

In these groups, the primary function of the space can often be more aligned with industrial processes rather than human comfort, which allows for the possibility of not needing a designated space-heating system. This is particularly important in environments where the risks associated with heating systems could outweigh the benefits, such as flammable materials that could exacerbate fire hazards.

In contrast, spaces where human comfort is essential, such as relaxation areas or indoor sports facilities, typically require some form of heating to maintain a comfortable environment for occupants. Therefore, the focus of the question centers on understanding the necessity of heating systems in relation to the specific requirements and classifications of different occupancy types, which is why Group F and H occupancies are recognized as exceptions in this regard.