4 RSC (Residential Security Container) Ability to withstand 5 full minutes of rigorous prying, drilling, punching, chiseling and tampering attacks by UL technicians. B Rating Doors of less than 1” thickness and a body construction of less than ½” thick. Steel construction. C Rating Door of at least 1” thickness and a body construction of at least ½” thick. Steel construction. 1 Hour vs. 2 Hours of Fire Protection What does a Fire Rating mean? A safe with a fire rating will maintain an inside temperature that does not exceed a certain level for a certain period of time. For example, a UL Class 350 1 Hour rated safe will maintain an internal temperature that will not exceed 350°F for up to 60 minutes. It is important to note that a UL 350 rated safe is designed for the storage of paper documents and not computer media. What is the 1 Hour UL fire rating? The most widely recognized industry standard for commercial quality fire safes is the UL Class 350 1-hour fire rating. This means that when the safe is exposed to external temperatures of over 1700°F, the internal temperature of the safe will not exceed 350° F for at least one hour. All products with this record protection equipment rating are meant to store only paper documents and files. What is the 2 hour UL fire rating? When a 1 hour rated safe isn’t enough, the next step up is the UL Class 350 2-hour fire rating. Much like the 1 hour rating, this means that when the safe is exposed to external temperatures of over 1700°F, the internal temperature of the safe will not exceed 350°F for at least 2 hours. These safes and fire file cabinets are meant to store paper documents and records. UL Fire Rating Guide Underwriters Laboratories
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