| 5.7. | When the tests are carried out in the open air, sufficient wind protection shall be provided and the wind velocity at fuel-pan level shall not exceed 2.5 km/h. Before the test the screen shall be heated to 308 K ± 5 K (35 ° C ± 5° C). The firebricks may be wetted in order to guarantee the same test conditions for each successive test. | a0c0 |