A drier for continuous flow drying of food products, especially pasta, inside the drier with adjustable and/or conditioning zones along the continuous flow path of the product. The inside of the drier can be accessed by a maintenance technician and the respective horizontal segments of the side walls are sub-divided perpendicular to the direction of the continuous flow from top to bottom into respectively at least two vertical segments which are respectively curved in an outer direction and which can also be moved away from the housing in an independent manner, enabling the maintenance technician to have access to the inside from the respective point of a vertical segment moved away from the housing.