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EX499 1 March 2, 2007 <br /> 06NK23629 <br /> 3,2 Ignition Between Two—40,ft High Storage with 48 ft High <br /> Ceiling <br /> Test 2 was conducted at approximately 9:00AM on Wednesday, December 27,2006. <br /> The initial temperature inside the test room was 72 °F. The outdoor temperature was 31 <br /> °F, 79%RH and winds were out the the southwest at 5 mph. A summary of the test <br /> results is presented in Table I. <br /> 3.2.1. Test Observations <br /> After ignition, the fire took about 40 seconds to reach the longitudinal flue. Once fire <br /> attached to the second tier of boxes, it quickly reached the ceiling. Visible flames along <br /> the ceiling extended 10 ft. outward in the east, west and south directions. Radiant heat <br /> from the main array ignited about 35%of the face of the north target array at 175 <br /> seconds, <br /> Table 5.Test 2 Visual Observations <br /> Time(seconds) Visual Observations <br /> 0 Ignition <br /> 49 Flames reach top of 2nd tier <br /> 55 Flames reach top of3rd tier <br /> 58 Flames reach top of 4th tier <br /> 59 Flames reach top of 5th tier <br /> ( 60 Flames reach top of 6th tier <br /> �y 62 Flames reach top of 7th tier <br /> 64 Flames reach top of 8th tier <br /> 73 Flames impinging on ceiling <br /> 94 First sprinkler activation <br /> 175 Face of north target ignites <br /> 3.2.2. Damage Assessment <br /> Damage to the main array was observed after fire suppression activity had ended. Most <br /> of the center two bays on both sides of the main array were involved in the fire as seen in <br /> Figure 17. As noted in Section 3.2.1, the north target array ignited. There was evidence <br /> of burn through at the seventh and eight tiers of the north target array,see Figure 18. <br /> 17 <br />