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In general, exhaust ducts should be provided with stainless steel sheets, zinc iron plates, or non-flammable materials of strength, heat resistance and corrosion resistance. In addition, when using flexible joints, only parts and lengths close to the exhaust fan should be minimized, and parts close to the hood should not be used. In the case of ducts used in restaurants such as restaurants, fires frequently occur by using flexible PVC ducts in adjacent areas of the hood to reduce costs. Regarding PVC duct ventilation, which is commonly used in restaurants and kitchens, we found that we are very vulnerable to fires because restaurant owners install flammable PVC ducts due to low installation and material costs. This is because there are no rules or regulations on duct types that can or cannot be installed. We investigated the vulnerabilities of using these ingredients in restaurant kitchens and strongly recommended establishing guidelines for using less flammable materials for safe duct ventilation.