The average house fire is 1200° F
The U.L. (Underwriters Laboratory) fire rating includes temperature and time.
One-Half Hour Rated Products - The furnace is heated up to 1550¡F over a one-half hour time period.
A Class 350° F means the internal temperature cannot exceed this temperature over the rated period and temperature.
30 minute - 1550°F One-Hour Rated Products - 1700°F Two-Hour Rated Products - 1850°F Three-Hour Rated Products - 1920°F Four-Hour Rated Products - 2000°F Class 350 - Paper which burns at 451 degrees F These keep humidity at less than 85% also Class 150 - Microfilm, microfiche and computer data tapes Class 125 - Developed for floppy disks. The electronic storage media of today like CDs and DVDs can safely withstand a temperature of up to 350 degrees. 350, 150 and 125° rated safes all use the same external temperature/time values. See: Best Fireproof Safe - Fire Rating | Jen Reviews Safe Ratings & Certifications | Water & Fire Rating
In a test with a fire dept. training burning, The small fireproof box was hard to find, but once they pried it open, not only was everything intact, but the CD still worked.
Media and Electronics:
Seagates non-operating temperature range -40 to 70 degrees Celsius (-40° to 158°F)
Wire insulation limits are 75-90° C (167-194° F). See wire knowledge | USAwire-cable.com
At temperatures between 120 and 180 degrees can create humidity that will corrupt or destroy data. To store data, look specifically for a media/data safe, or any safe that will keep the internal temperature below 135 degrees and humidity below 85%. (DependableSafes.com)
Letter size: 8.5 x 11 (envelope 9.5 x 12.5)
Legal documents are 8.5" x 14" (envelope 9.5 x 15 or 11 5/8-x 15 1/8").
ISO paper size
A3 11.7 x 16.5 in
A4 8.3 x 11.7 in
Note 1: Most include a 24-48 hr waterproof seal.
Note 2: Most of these list the external temperature and time e.g. 1550° for 30 min for protection, but only one (the First Alert 2040F, which has a 125° rating) listed the internal temperature, which is the critical factor. There are three standards for internal temperature (see above).
SentrySafe QA0121 ($62) allows you to attach an external USB 2.0 2.5 inch HDD/flash drive inside the protective enclosure while accessing it via a usb port located on the outside of the enclosure. Includes 10 CD/DVD sleeves organizational divider. 30 min. protection.
Amazon.com: fireproof security boxes
The Best 8 Home Safes Reviewed Ð Wall, Gun, Lock Box and Depository Type
Security Safes | Home Safes for Sale, Fire Safe Boxes | Staples®
Best Fireproof Safe | Jen Reviews
In case of a fire the floor below a safe may collapse, so consider that in placement.