 Still, for the person designing, building and paying for the test, the fire resistance itself may be rather uneventful unless major problems appear.The burn itself is the long duration, up to 4 hours, but the hose stream test only lasts a few minutes, with large damage potential due to the sudden thermal and kinetic impacts, as the fire was upwards of 1,100 °C (see curves above), whereas the sudden hose-stream test is as cold as the domestic water fed to the fire hose used in the test, which might be 10-20 °C.This combined impact explains the debris that can be seen coming from test specimens during the hose stream test, as seen herein.