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In the context of new business occupancies, the corridor wall rating requirement is that no fire resistance rating is typically mandated. This is based on the understanding that business occupancies are vulnerable to fire but are generally designed with safety measures such as sprinkler systems, which play a crucial role in extinguishing or controlling fires before they can spread significantly.

In sprinklered business facilities, the corridors are considered lower risk areas because the presence of sprinklers helps manage potential fire hazards effectively. While some occupancy types, such as those involving high risks, may have stricter requirements, business occupancies benefit from codes that acknowledge the significantly reduced fire risk and potential for rapid evacuation pathways.

Thus, the absence of a required fire resistance rating for corridor walls reflects this balance between safety, design intent, and regulatory considerations in business occupancy spaces.