Gastronorm pans are commonly called GN pans in the catering business. Gastronorm is a European standardized term used to classify trays, containers and pans in the commercial food industry. GN pans are some of the most used pieces of professional cooking equipment. They are used in the catering business for cooking, chilling, buffet displays or storing food. This method of sizing is used to measure the maximum capacity of a pan or a container and is based on the dimensions of the outer pan or container. The full Gastronorm size is 530mm long and 325mm wide. There are eight more sizes that have been derived from this dimension.