One- Hour . will withstand fire reaching 1,700 ?F (927 ?C) for one hour , keeping the interior temperature below 350 f (177 C).
  Two-Hour. Will withstand fire reaching 1,850 F ( 1,010 C) for at least two hours , with interior temperature not exceeding 350 F( 177 C), during and after exposure.
  Four -Hour. Will withstand fire reaching 2,000 ?F( 1.093 ?C) for at least four hours , with interior temperature not exceeding 350? F (177?C) , during and after exposure.
  Six-Hour. Will withstand fire reaching 2,150 ?F (1,177 ?C) for at least six hours , with interior temperature not exceeding 350? F ( 177? C) , during and after exposure.
UL fire- resistive labels.
| UL- listed relocking device. Qualifies for class "B" Mercantile Burglary Insurance rating. |