Abstract: An improved type of oven is disclosed for drying or curing a photosensitive material applied by coating on a substrate or board.The oven substantially comprises a substrate or board feeding station provided with a device for centering the boards, and which leads them, one by one, into the oven. Within the oven there is provided a first operating unit adapted to subject the substrates or boards to a rising motion, all the way up to the upper end thereof, where a device is provided to transfer one substrate or board at a time to a second operating unit, substantially identical to the first one, adapted to subject the substrates or boards to a lowering motion. At the lower end of the second operating unit there is provided a device for withdrawing and unloading those substrates or boards where the material has dried up or cured.