According to the law, a store without a smoke duct is not allowed to be a restaurant. Bun stores that fall under the catering category would be best served by installing smoke extraction ducts.

Applicants to the Food and Drug Administration to apply for a food service license should have the following basic conditions: with the production and supply of food varieties, the number of food ingredients and food processing, storage and other places to keep the place environment clean, and with toxic, harmful places and other sources of pollution to maintain a prescribed distance. With the production and supply of food varieties, the number of appropriate business equipment or facilities, there are appropriate disinfection, changing clothes, hand washing, lighting, lighting, ventilation, refrigeration and freezing, dust, flies, rodents, insects, washing, and treatment of wastewater, storage of garbage and waste equipment or facilities.