He also said that a room will burn for about an hour to an hour and 15 minutes if not addressed. Larry McKenna, a fire protection engineer at the US Fire Administration, an entity of FEMA, told us that the temperature at a room’s ceiling can reach 2,000 ☏ during a fire, though there’s a gradient, with the highest temperatures at the top. Tape recordings and film slides fall in between at 150 ☏. Part of the testing evaluates how suitable the safes are for different kinds of contents: The internal temperature must stay under 350 ☏ to keep paper safe, while digital media has a failure threshold of 125 ☏. The next level up is 60 minutes at 1,700 ☏, which offers a greater degree of security. This is a common certification from both UL and ETL. Most household safes are rated to last 30 minutes at 1,550 ☏, a standard based on modern firefighting response and how a fire typically moves through a house. Then the testers drop the safes three stories before placing them back in the furnace for more heat testing. Testers put the safes in a furnace at a specific temperature, for a specified amount of time a safe-maker can request tests at different temperature and duration marks. He said UL tests to different ratings depending on what kind of rating the manufacturer wants. We spoke to John Drengenberg, consumer safety director at UL, about the organization’s testing procedures.
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