No open ditch is allowed in the kitchen special room and food preparation place in the food processing area. According to the relevant public information, the drainage pipeline in the kitchen should be unobstructed, and no open ditch should be set in the clean operation area. No open drain should be set in the clean operation area such as the kitchen special room and the food preparation area, and the floor drain should prevent the polluted air from escaping. Open ditches in kitchens and food preparation places are easy to connect the kitchen with water and land, which stinks.