Abstract: A protective and insulating enclosure for a transfer unit of the conveyor type, the enclosure formed by lateral sides consisting of panels (2) removably mounted between a bottom carrier profiled section (6) and a (7), the panels are separated laterally by joining profiled sections, a top cover formed by sloping panels (121) with an end housed so as to be encased in a linear cavity (134) in a rear top profiled section (127), a front end of the top panels bearing on the longitudinal top holding profiled section, and the top panels separated by lateral joining sections (128, 129), a bottom enclosure consisting of a central recovery channel (120), between two longitudinal bottom carrier profiled sections (6, 176, 177), the central recovery channel having removable plates (118, 119, 189) sloping towards the central recovery channel enabling all panels to be fitted and removed easily and rapidly without any tool or equipment.