A channel to be laid out onto a floor (17) of an apparatus for drying harvested products is provided. The cross section of the channels (2) is semi-circular and the channels are provided with circumferential ribs (11) for reinforcement. Along the longitudinal edges (3, 4) of the channels (2) base pieces (15) are provided which partly close the channels (2) tightly to the floor (17) and partly on the inside of the channels (2) together with the ribs (11) in the walls of the channels (2) form upwardly open grooves (27), whose cross section decreases downwards. In the inwards sloping part (14) of each rib (11) there is an oblong vertical opening (5) which may discharge a forwards sloping and outwards directed air flow for transportation of the products. The openings (5) open into the channels (2) and due to their downwards decreasing cross section a heavy air flow is produced which will prevent clogging of the openings (5) when the material is finely grained, such as is soyseed or oilseed.