The study of temperature and visibility in the parking lot of the commercial complex was done using the Fire Dynamic Simulator code with various fire accidents. Specification fire of parking was obtained in different fan system conditions. The temperature and visibility of a stairwell under multiple conditions were contrasted. The values were obtained at a height of 1.6m. The results showed that temperature and visibility reached 80°C and 1 meter in the first state in the 1200s after the fire. In the second state, visibility reached 6.34m in the 1200s, 6.34 times better than in the first. The temperature also decreased to 51.11°C in the 1200s. The temperature improved by 36.19% compared to the first state. In the third state, after the 1200s, the temperature decreased to 44.72°C. In the third state, the visibility was 15.59m, which improved 15.59 times in the first state.

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