When using stairs to ascend during a high-rise fire, how often must crews check their air supply?

In high-rise fire scenarios, maintaining an adequate air supply is critical for the safety of crews as they ascend stairs. Checking air supply every 5 floors ensures that firefighters keep a close watch on their air consumption and the potential need to replenish it as they continue to ascend. This strategy helps to manage their resources effectively amid the demanding conditions of a fire.

Checking air supply after 5 floors allows firefighters to assess whether they have enough air for the ongoing operation and, if necessary, to implement plans for refilling or exiting. The frequency balances the need for regular checks while considering the physical exertion and time constraints faced in high-rise scenarios. This systematic approach is essential for maintaining situational awareness and preventing air supply emergencies during critical operations.