house the other end of the resistance that which is connected to the electricity supply cable the special arrangement and configuration of the electrical resistance means this offers its profile to the air passage so that the obstructing surface of this resistance is minimum and consequently minimum also the resistance to the passage of air which implies a remarkable decrease in the head loss at the same time a greater contact surface is achieved with the air since for a same section in the resistance the external surface is considerably greater in the case of a laminate of reduced thickness than in the case of the classic resistances of circular section which signifies a greater transfer of heat the form of the housings for the resistance guarantees the reliability of the heater since its correct fastening is assured and the resistance suffering modifications in its original geometry produced by thermal dilation is avoided these thermal dilations of the resistance are absorbed by the arched lodging channels present in the insulating supports that in turn isolate the electrical resistance from the body of the heater the employment of an electrical resistance in tape form provides the advantage that the heater is more robust with respect to the mechanical vibrations to which it can be subjected which can become very intense.