6 cm wide 15 cm high food can pass through. The maximum size of food that can pass through the spray door is generally 6 cm wide and 15 cm high. This is because the design of the spray gate must ensure that food can flow along the pipeline without being stuck or dead ends. Spray door is a special catering equipment, which is used to distribute food, such as hamburgers, pizza, pasta and so on. It uses pressure to spray food out to serve quickly.