What is the required fire resistance rating (FRR) for combining occupancy types with F1?

The required fire resistance rating (FRR) for combining occupancy types with an F1 occupancy type, which is categorized as a medium hazard industrial occupancy, necessitates specific fire resistance ratings for different types based on their risk levels and regulatory requirements.

The option that states D (3hr), E (3hr), F2 (2hr), and F3 (2hr) reflects the necessary fire resistance ratings for the other occupancy types that can be combined with F1. Fire resistance ratings are determined to ensure that structures can withstand fire for a certain duration before allowing spread that could endanger occupants and lead to structural failure. For instance, D (3hr) implications focus on higher risks typically associated with certain types of industrial activities, while E and F2 have specified ratings to ensure adequate time for evacuation and fire control.

Consequently, the other options do not correctly represent the required fire resistance ratings for combining with F1, as they either underestimate the required FRR for certain occupancy types or provide ratings that are not compliant with the building code provisions for hazardous and mixed-occupancy scenarios. Understanding these combinations is crucial for ensuring safety regulations are maintained during architectural design and code compliance.