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• • ihreTESTING The wall assembly was being evaluated for a rating of 4 hours. The test was conducted on February 9, 1991, with Messrs. Walter and Whitt present to witness the test. Moisture Content: Three days prior to the test, a 1.50-inch diameter core sample was taken at mid-depth from the wall assembly. The moisture content, determined by the oven dry method, 221°F for 36 hours, was 3.948. Gas: A cumulating type gas flow meter was used to measure the amount of natural gas consumed during the 4 hour test. A total of 7,104 cubic feet (7,142,416 Btu) was used. Furnace Temperature: The standard time-temperature curve was followed using thermocouples located within the furnace as shown in Figure 1. The recorded tempera- ture curve is shown in the Appendix to this report. Unexposed Face Temperatures: The temperatures recorded by thermocouples attached to the unexposed face of the test wall, located as shown in Figure 2, are presented in the Appendix to this report. The test method states in Section 17 that transmission of heat through the wall shall not raise the temperature on the unexposed surface more than 250°F above the initial temperature, nor shall there be flames or gases hot enough to ignite cotton waste. The initial temperature was 67°F. Therefore, the maximum allowable average temperature rise was 317"F. The temperatures recorded at 240 minutes ("F) were: Thermocouple Maximum Position Temperature Temperature Rise 1 138 71 2 139 72 3 193 126 4 191 124 5 158 91 6 186 119 7 171 104 8 189 122 9 195 128 The temperatures on the unexposed face were not hot enough to ignite cotton waste fibers. Optional Temperature Measurements: Three additional thermocouples were used to measure temperature rise. The placement of the thermocouples is shown in Figure 3. The thermo- * it, COMMERCIAL. TESTIIIG COmPAGY