Rust is a prime enemy of firearms, and leaving them in a gun safe with no air circulation allows moisture to accumulate. This creates a perfect situation for rusting. A rod-type dehumidifier is used by many gun owners to prevent moisture. The heated air rises from the floor out of the vents, taking any moisture along with it.
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Arrange the contents of the safe to ensure good air circulation between the firearms and from the bottom to the top of the safe.
Detach the electric cord from the dehumidifying rod and lay the rod on the floor of the safe, toward the front.
Pass the electric cord through the hole in the back of the safe and reattach it to the rod.
Turn the rod on.