At what pont should you open all windows and hatches while fueling?

All Windows and hatches should be opened during fueling when there is a risk of fuel vapors accumulating, which can create a hazardous environment. This is particularly important in enclosed spaces where ventilation is limited. Ensuring proper airflow helps dissipate any potentially harmful vapors and reduces the risk of fire or explosion. It's essential to follow safety guidelines and regulations specific to the fueling process to maintain a safe working environment.