A vertical oven for drying and temporarily storing painted panels includes racks for supporting the panels; an uploading/downloading system into/from the vertical oven; and a stacker crane having two multiple forks each including a plurality of single forks, a first multiple fork withdrawing the panels from a first side of the oven and a second multiple fork withdrawing the panels from the opposed side of the oven, the panels being positioned on the racks side by side or alone based on width. A control unit controls panel uploading/downloading and/or the stacker crane through a control software. Each single fork has an independent actuator and is separately controlled by the control unit. The software configures the control unit to determine the number of single forks to be actuated according to the length of the panel to be withdrawn, and the length of the stroke of the forks based on panel width.