System for conveying products (2, 3), comprising - a conveyor with a carrying surface for the products (2, 3) and with a drive device for moving products (2, 3), located on the carrying surface, in a conveying direction; - a supply conveyor that is connected to the conveyor at a supply location, with a supplying carrying surface (14a-c) for products and with a supply drive device for moving products located on the supplying carrying surface (14a-c) in a supply direction and transferring these products to the conveyor; - a control device that is configured for controlling, in operation, the supply drive device in such a way relative to the drive device that a product is transferred from the supply conveyor to a predetermined position (22, 22') on the conveyor; wherein the supply conveyor comprises a positioning portion and the supply drive device is configured to speed up or to slow down a product at the location of the positioning portion in order to ensure that the product, on being transferred from the supply conveyor to the conveyor, moves to the predetermined position on the conveyor; characterized by: - a blowing device, configured for generating, in operation, under the influence of the control device, an air stream from above the supplying carrying surface in the direction of the supplying carrying surface at the location of the positioning portion, for forcing, in operation, products against the supplying carrying surface. - a conveyor with a carrying surface for the products (2, 3) and with a drive device for moving products (2, 3), located on the carrying surface, in a conveying direction; - a supply conveyor that is connected to the conveyor at a supply location, with a supplying carrying surface (14a-c) for products and with a supply drive device for moving products located on the supplying carrying surface (14a-c) in a supply direction and transferring these products to the conveyor; - a control device that is configured for controlling, in operation, the supply drive device in such a way relative to the drive device that a product is transferred from the supply conveyor to a predetermined position (22, 22') on the conveyor; wherein the supply conveyor comprises a positioning portion and the supply drive device is configured to speed up or to slow down a product at the location of the positioning portion in order to ensure that the product, on being transferred from the supply conveyor to the conveyor, moves to the predetermined position on the conveyor; characterized by: wherein the supply conveyor comprises a positioning portion and the supply drive device is configured to speed up or to slow down a product at the location of the positioning portion in order to ensure that the product, on being transferred from the supply conveyor to the conveyor, moves to the predetermined position on the conveyor; characterized by: - a blowing device, configured for generating, in operation, under the influence of the control device, an air stream from above the supplying carrying surface in the direction of the supplying carrying surface at the location of the positioning portion, for forcing, in operation, products against the supplying carrying surface.