Cultural center, heritage buildings, libraries and museums provides us with unique historical record.The buildings and the documents preserved within them are of inestimable value, which  makes the places worth to protect. 

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Generally, the preservation of historical documents or works of art is  extremely strict, and the possibility of spontaneous is minimal. However, there are other factors that could have caused fire, such as outdated electrical equipment, power distribution cabinet and cables. If a fire does occur, some flammable materials such as paper, wood and cardboard are perfect fule to accelerate the spread of the fire, the damage is disastrous and irremediable. 

 

Hence, reliable very early smoke detection with high sensitivities and robust design is significant important to be used to protect heritage sites. Smoke detectors can detect smoke-laden air in incipient stage and provide multiple alert levels  to staff by visible light and sound, which they can have more time to deliver a decisive response to stop the development of fire.