b'Sill The wall was constructed on top of a non-combustible sill. The sill included a 350-mm x 350-mm metal framed boxed section lined with 6-mm fibre cement sheeting. The cavity of the framing was filled with Rockwool insulation. 2.2Orientation The external wall specimen was tested with the sill and the exterior face of the wall exposed to the radiant heat source. 2.3Crib size The crib size selected by the test sponsor for the relevant BAL level was Class AA, as specified in Table 3.2 of Section 3.8 of AS 3959:2018. Three cribs were used, crib #1 was located in the internal corner of the wall rebate, Crib #2 was located adjacent to the panel joint left of the window, while crib #3 was located adjacent to the panel joint right of the window, as shown in Photograph 11 (Appendix B). 2.4Conditioning The external wall system did not include exposed timber elements. The specimen construction was completed on 28th April 2022 and stored under standard laboratory atmospheric conditions until the test date. 2.5Level of radiant heat exposure The level of radiant heat exposure selected by the test sponsor was Very high - 29 kW/m. 2.6Selection,constructionandinstallationofthespecimenandthe supporting construction The construction was organised by the sponsor, CSIRO was not involved in the selection of the materials.3Documentation The following documents were supplied or referenced by the sponsor as a complete description of the specimen and should be read in conjunction with this report: Drawings numbered TPC-T001, sheets 1-4, dated 22 March 2023, by Delta Panels. Drawings numbered TPC-T002, dated 15 February 2023, by Delta Panels. Drawings numbered TPC-T003, dated 15 February 2023, by Delta Panels. Drawings numbered TPC-T004, dated 22 March 2023, by Delta Panels. No confidential information about the test specimen has been submitted to CSIRO Infrastructure Technologies FSZ 2373| page8 of 38'