In this paper, we studied the structure of the roast hood, predicted fire hazards through statistical data, and examined the possibility of igniting the roast hood and the variation in the potential for ignition by installing the fire prevention net. It was observed visually that fluoride caused by charcoal was sucked into the roast hood due to the negative pressure caused by the operation of the motor. In addition, the frequency of charcoal burns carried into the roast hood according to the installation of the fire prevention network was compared. This paper identifies the structural fire vulnerability of the Lost Hood, provides users and manufacturers with information on fire risk from installation of the fire prevention network, and improves the device to allow more stable use of the device, helping to infer the cause of the fire.