needed to ensure a minimum temperature in an enclosure, most manufacturers offer calculation programs (see Pfannenberg Sizing Software ). Knowing some environmental values of the installation site and material [...] e pairing of relative humidity and temperature to which the case is exposed. In this way, one can see to what extent larger temperature differences (even if it is relatively warm outside the enclosure) [...] advantageous to place the heater near the floor to take advantage of natural convection (e.g. FLH-T , see Figure 2). When placing heaters, not only their dimensions should be considered, but also the distances