Abstract: Gas-condensation device consisting of an enclosure (3a) and chambers (1,2) for collecting the cooling fluid, the enclosure (3a) containing gases which are at least partially condensable and at least one bundle (3) of horizontal smooth tubes inside which the cooling fluid runs and which are arranged regularly in a bundle and supported by intermediate support plates and/or support grids (3b) situated between the collecting chambers, characterized by the replacement of at least part of an oblique descending row of tubes (3) by shaped elements (20) for catching and removing the condensates and which are each offset in a same direction relative to the upper neighboring element.