The size of the drain from the wall of the restaurant kitchen should be determined according to the specific situation. Generally speaking, it is recommended that the distance from the wall be between 31 and 51 cm.

first of all, the distance between the drainage ditch and the wall should take into account the layout and connection of drainage pipes. If the drainage ditch is too close to the wall, it may affect the layout and connection of drainage pipes, resulting in poor drainage or water leakage. Therefore, it is suggested that the distance between the drainage ditch and the wall should not be less than 31 cm.

Secondly, the distance between the drain and the wall should also take into account the use of the kitchen. If the drain is too far away from the wall, it may affect the efficiency of the kitchen and increase the difficulty of the work. Therefore, it is suggested that the distance between the drainage ditch and the wall should not exceed 51 cm.

finally, the distance between the drain and the wall should also consider hygiene and cleanliness. If the drainage ditch is too close to the wall, it may lead to wall pollution and increase the difficulty of cleaning. Therefore, it is suggested that the distance between the drainage ditch and the wall is 31-51 cm, which can not only ensure smooth drainage, but also ensure the efficiency and hygiene of the kitchen.