The machines are completely faired and provided with some safety devices according to the CE regulations in force. All the models are provided with some digital electronic instruments for the control of the times and of the temperatures of the cycle. The dryers mod. 250 RR are double tilting, as they tilt backwards to facilitate the loading operations and tilt forwards in order to unload automatically in the trolley at the end of the cycle. The machine tiltings and the door opening are pneumatically operated. All RR models can be realized either with steam or with gas or with diathermic oil heating. The gas models are provided with a burner with an adjustable flame. built according to the CE regulations in force.