Previous studies have shown that there is a large difference in the temperature of smoke in the upstream and downstream of a vertical shaft. but no quantitative study on the subject has been conducted. In this paper. a model experimental test was conducted to study the effect of a natural vertical shaft on the distribution of smoke temperature in tunnel fires. https://www.remtavares.com/best-offer-Merrick-Backcountry-Grain-Free-Kitten-Pate-Canned-Wet-Cat-Food-5-5-oz-Cans-Case-of-24-p14288-limited-choice/