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In the context of mechanical ventilation during a fire, firefighters should avoid placing the fan against the wind because this can lead to ineffective ventilation and potential complications. When the fan is positioned against the wind, it can cause exhaust smoke and heat to be pushed back into the structure rather than expelled. This scenario can create hazardous conditions for both victims inside and the firefighting team, as it inhibits the flow of clear air into the structure and may trap smoke and toxic gases within.

Proper mechanical ventilation requires careful planning and execution to effectively control smoke and heat. By positioning fans to work with the wind, firefighters can enhance air circulation and improve visibility, making the environment safer for everyone involved. This approach maximizes the efficiency of the ventilation effort, ensuring that smoke is vented out while fresh air is drawn in from a safer location.