Surfaces in the food preparation area that do not come into contact with exposed food are considered non-food contact surfaces.
What work surface is not permitted in food service areas?
Work surfaces must be simple to clean or disinfect. The surface must be smooth, washable, and non-toxic. Unsealed wood is not recommended.
A non-food contact surface is a component of a piece of equipment or instrument that comes into contact with food but does not actually come into contact with it. A conveyor belt that transports food from one location to another, for example, is a non-food contact surface.
Therefore, to prevent food contamination when equipment or instruments come into contact with non-food items, non-food contact surfaces must be cleaned and sanitized as needed (e.g., laundry, utensils, etc.).
Learn more about food contact surfaces from the given link.
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