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What is the difference between 1, 2 and 3 hour fire resistance?

 Fire safes and file cabinets with 1 hour fire ratings are tested to 1700 degrees F for 1 Hour, while 2-hour ratings are for the full two hours and then 3 hours for the highest fire resistance rated products.

 Below is a complete explanation of the UL 350 Rating for paper documents and records and the UL 125 Rating for removable computer media and external hard drives.

 

UL Class 350 2-hour
View Products Online: FireKing 2 hour files FireKing 2 hour safes  Burglary Fire Safe
The UL Class 350 2-hour fire rating provide a full two hours of fire disaster protection. The safe or file, when exposed to external temperatures up to 1700°, the internal temperature of the produce will not exceed 350° for at least 2 hours. These products are designed to protect paper records with the highest level of protection.

UL Class 350 1-hour
View Products Online: FireKing Files  FireKing Cabinets  FireKing Safes
Paper chars at 400° and burns at 451° (Do you remember the classic book Fahrenheit 451?) A safe or filing cabinet with a UL Class 350 1-hour fire rating means that when it is subjected to external fire temperatures up to 1700°, the internal temperature of the safe will not exceed 350° for at least one hour - a product with this class of listing is designed to protect paper records but NOT computer media (for media protection you can use a MediaVault insert)

UL Class 125 3-hour
View Products Online: Data Media Safes
The best fire safe rating standard available today is the UL Class 125 3-hour fire rating. Only FireKing Safes offer this level of fire disaster security! When the 3 hour safe is exposed to external temperatures up to 1700°, the internal temperature of the safe will not exceed 125° for at least three hours. If you need to ensure the best protection of your removable computer media, CD’s, DVD’s, and external or portable hard drives then this is the best safe to buy.

UL Class 125 2-hour
View Products Online: Data Media Safes
A two hour rated safe is a great choice for the storage of large quantities of tapes and other removable media. Any safe with the UL Class 125 2-hour fire rating means that when exposed to external temperatures up to 1700°, the internal temperature of the safe will not exceed 125° for a minimum of two hours. At 125° F digital data and media can easily be ruined often causing a severe loss to business operations.