The archives or reference rooms for storing important data should be equipped with gas fire extinguishing system. Carbon dioxide can be used, but be careful when putting out the fire. Not recommended. Because dry powder, foam and water system will pollute the archives. And it is not easy to clean, so it is recommended to use Dingya brand heptafluoropropane fire extinguishing device. Colorless, odorless, clean, non-conductive, low toxicity, high fire extinguishing efficiency and no pollution to the protected object.