If you want to prevent your guns and ammunition from getting rusted, you should always protect them from humidity. Depending on what kind of safe you own and its location, moisture may develop inside the safe and can damage the content beyond repair.
Therefore, we recommend that you open the safe every 2 weeks for at least 15 minutes, to ensure that your documents/guns remain in pristine condition.
Furthermore, you should always pay attention when choosing where to install the safe. It is always better to avoid places with high humidity levels, such as basements or any places close to laundry rooms.
It is also advisable to place a dehumidifier in the safe if it is in an area with high humidity.