The roasters in the UG retro series cover roast capacities of 15 and 22 kg per batch. Each machine is made individually by hand on request, with extraordinary precision. With all UG retro machines, the volume flow of the roasting air can be individually adjusted to the respective roasting phase by means of a converter on the roasting fan. In addition, the traditional "aroma wheel" offers the possibility of completely suppressing the volume flow in the drum.