## 5 Conclusions  
In this study, a fire impact assessment was conducted on three types of building finishing materials (polyurethane foam, MDF, and CFRPBM) in response to changes in the indoor floor area. For the fire risk assessment, the ASET of life safety criteria in three items--temperature, visibility, and FED--was measured, and the following results were derived through an analysis of the measurement results. 1. When the aspect ratio increased by 1, the ASET for temperature and visibility rose by an average of 1.5 to 2.0 s for all three building finishing materials. However, the impact on the FED's ASET varied considerably. Polyurethane foam and MDF saw average increases of 1.1 s and 2.1 s, respectively. In contrast, CFRPBM exhibited a substantial increase of 29.41 s, highlighting a significant difference in fire safety performance for larger compartments. 2. Increasing the area while maintaining the aspect ratio resulted in an average ASET increase of 2.5 s to 6.81 s for polyurethane foam and MDF. CFRPBM, however, exhibited a larger increase in the ASET, with average delays of 41.0 s, 13.2 s, and 82.8 s for temperature, visibility, and FED, respectively. This suggests that CFRPBM may offer an advantage in securing an ASET for temperature and FED in larger compartments. 3. Regardless of the type of increase in the floor area, both polyurethane foam and MDF exhibited a slight increase in the ASET within 8.5 s as the area expanded, with smoke spreading over the entire area within 42.0 s.
4. The ASET of CFRPBM showed different results depending on the shape of the floor area. When the floor area was increased proportionally by the aspect ratio, the increase in the ASET tended to be uniform. However, when the area increased with the same aspect ratio, it was observed that the increase in the ASET gradually rose. In particular, in the case of temperature, it was noted that the increase in the ASET escalated rapidly when the length of the floor surface exceeded 6 m. This was attributed to the flame-retardant performance of CFRPBM. Therefore, it was demonstrated that the larger the size of the room, the more effective it was in securing the ASET. 5. The fire risk assessment of building finishing materials was conducted by incrementally increasing the floor area in five stages based on the aspect ratio. As a result of the study, when the building finishing material is CFRPBM, the correlation between temperature, visibility, FED's ASET, and changes in floor area conditions can be expressed by the trend equation provided in Equation (6) through (10). 6. By monitoring temperature changes over time, we observed a maximum internal temperature increase of 433 \({}^{\circ}\)C for CFRPBM within 400 s. This finding suggests a very low risk of flashover, indicating CFRPBM's strong flame-retardant performance. 7. This study investigated the effectiveness and correlation between fire risk and cellulose-based building finishing materials by assessing fire risk while varying the building's floor area based on its aspect ratio. This research method demonstrates the potential of big data analysis for evaluating fire risk, predicting fire characteristics and making ASET predictions based on the chosen building finishing materials. However, further research is necessary to explore the combined impact of changes in both area and volume, including the fire space height and the reference length used for aspect ratio calculations. Additionally, comprehensive big data and ensuring the reliability of building finishing materials require further research and cross-validation using various up-to-date numerical models. Experimental data, including thermal pyrolysis data, are also considered essential for determining the chemical properties of building finishing materials. Conceptualization, D.R. and Y.K. ; methodology, D.R. and Y.K. ; software, Y.K. ; formal analysis, Y.K. ; investigation, Y.K. ; resources, Y.K. ; data curation, Y.K. ; writing--original draft preparation, Y.K. ; writing--review and editing, D.R. ; visualization, Y.K.