When evacuation is necessary, what should occupants do if a stairwell is affected by smoke?

Selecting an alternate stairwell is the appropriate action when evacuating occupants if the primary stairwell is affected by smoke. Smoke can severely reduce visibility and poses a significant health risk, which makes using a compromised stairwell dangerous.

By directing occupants to choose an alternate stairwell, it ensures that they are using a safer route to exit the building and reduces the likelihood of exposure to smoke and toxic fumes. In high-rise buildings, it is crucial to have multiple evacuation routes, and an alternate stairwell should be designed for such emergencies. This option emphasizes the importance of strategic planning in emergency responses to protect occupants.

The other choices suggest using stairwells or methods that could expose individuals to greater risks. For instance, using the same stairs as the Fire Department could lead to congestion and confusion, and evacuating to a level below the fire floor does not address the immediate danger posed by smoke. Additionally, using elevators in a fire situation is generally discouraged because they can malfunction, become inoperable, or open onto a floor where there is active fire or smoke. Thus, the guidance to select an alternate stairwell ultimately upholds safety and enhances the chances of a successful evacuation.