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When a fire occurs, people often blindly seek exits for escape.Fire alarm door is a kind of door with warning function. There is a LCD screen on the centre of the door, which is usually used as doorplate. When the fire alarm system is activated, the doors would be converted into warning status. The sensors of pressure, temperature and smoke on the doors will also simultaneously activated, meanwhile the LCD screen will show the inside status of the house accurately and the prompt of the current state would be projected on the ground to facilitate the escaping personnel to choose the reasonable path and region for effectively evading danger.