(Our 60Kg safe )Our safe with national certification, and national fireproof test certifications. We are a professional security products manufacturer with 50 experience. Wide Range In Stock. Process Report Throughout. Factory Direct. Remote Install Guidance. 24/7 Support. The first number, i.e., 350 or 125, represents the maximum internal temperature of the safe. Paper burns at 350 degrees, so the maximum temperature inside of a record safe is 350 degrees. The most secure place to install a safe would be at the corner where two outside walls meet. This provides the most protection and support for a heavy safe. In a house that has multiple levels, it’s best to keep the safe on the ground floor.