Safe (container)
Fire ratings are usually based on how long the safe can be in a common structure fire before the inside of the safe reaches 175 degrees Celsius. This is the temperature at which paper and wood are destroyed. The fire rating usually ranges from 15 minutes up to 3 hours. Some safes are also waterproof, which both protects the contents from flood and prevents the contents from getting wet when a fire is put out by firefighters. A large safe that is part of a building is called a vault. Vaults have usually one or more rooms.