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Device to prevent fires

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    I want to create a device to prevent fires? It will be a small canister placed inside a wall and connected to an electrical outlet. This device will monitor the temperature of the outlet: in case it reaches 250 degrees (combustion occurs at 426 degrees), the canister will eject special foam that will cool the wires, displace oxygen and insulate the surrounding combustible materials.
    The foam spilt out of the outlet indicates that a fire has been prevented and that the outlet should be serviced.
    The foam will be nontoxic and won't stain. It will dry to a crust that will be easily broken down into a powder and vacuumed up.
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