you shouldn't. Connecting the gas accident exhaust fan to the emergency electricity may cause problems in the emergency circuit, so it should not be. The exhaust fan can achieve ventilation effect by exhausting air indoors or outdoors. The flow of air around the human body can promote the evaporation of body fluids, and the exhaust fan can naturally cool down, thus avoiding the uncomfortable reaction caused by stuffy heat, odor, dust, lampblack and other poor ventilation.