Positive pressure fan and smoke exhaust fan is part of the fire equipment and facilities. If: a fire in the building, the automatic fire alarm system will be linked through the device, automatically start the positive pressure fan and smoke exhaust fan, to the indoor corridor to send natural air to the facilities called the start of the positive pressure fan, to the indoor corridor of the toxic smoke forced to discharge to the outdoors of the equipment called smoke exhaust fan. In case of fire, the air supply and smoke exhaust is to prevent people from suffocating.