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The Air Guard can automatically activate itself to open or close according to Vault Door's status.
The Air Guard will close automatically when power failure; when the power restores, it will act as normal, needless to reset it.
When the Air Guard closed, it can cut off the circulation of hear, flame and smoke between inside and outside of Vault, also to prevent personnel and animal from entering or exiting.
The Air Guard is equipped with sensitive sensors for detecting smoke and heat. When the temperature is excessive heat or a heavy smoke occurs, the Air Guard will close automatically to secure the valuables in the vault.
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