In aircraft-related occupancies, what fire-resistance rating is required for walls closer than 35 feet to public ways?

For walls in aircraft-related occupancies that are situated closer than 35 feet to public ways, a fire-resistance rating of 2 hours is required. This requirement is established to ensure a high level of fire safety, considering the potential risks involved with aircraft operations and the presence of flammable materials.

A 2-hour fire-resistance rating signifies that the wall can withstand fire for at least two hours, providing adequate protection to both the building occupants and nearby structures. This rating also plays a critical role in preventing the spread of fire to adjacent public areas, enhancing the overall safety of the vicinity around the aircraft-related occupancy.

The options reflecting lower fire-resistance ratings, such as 1 hour or those exceeding 2 hours, do not meet the specific safety requirements for such close proximity to public ways, thereby failing to provide adequate protection in the context of fire safety regulations for these types of buildings.