A double-walled pipe for realising manufactured products for discharge of fumes and/or for extraction of vapours and/or for ventilation of rooms and/or for extraction of fumes, by consecutively inserting a plurality of double-walled modules that are joined in succession, comprising: a plurality of modules, each comprising a respective double-walled tubular element; each double-walled tubular element extending between a male end and a female end and comprising an internal tube and an external tube, arranged coaxially with respect to the internal tube so as to define a double-walled structure; each tubular element comprising an internal gap arranged between said external tube and said internal tube in which an insulating cladding is arranged, ends of two joined tubular elements comprise respective recesses (16, 17) and projections (19, 20) extending towards the other tubular element and involving only a part of the thickness of the cladding in a radial direction with respect to the tubular element so that in the joined configuration a reciprocal overlapped joint of the recesses (16,17) with the projections (19, 20) is realised between each module and an adjacent module; characterised in that the internal tube of a module terminates, at the female end, with a cone-formed end which broadens progressively towards an outside of the tube in the axial direction; the internal tube of a further module to be joined to the first internal tube terminates, at the male end, with a cone-formed end which narrows progressively towards an outside of the tube in the axial direction so as to insert internally of the female end of the first module; said cone-formed ends of the two modules to be joined substantially having a same conical angle so as to define a mechanical conjunction and a seal against fumes; one of said recesses being realised at the male end of a first module between the internal tube and a rest of the cladding in a radial direction with respect to the tubular element, and one of said projections being realised at the female end of a further module between the internal tube and a rest of the cladding of the first module joint to the further module in a radial direction with respect to the tubular element, so as to insert internally of the recess of the first module. a plurality of modules, each comprising a respective double-walled tubular element; each double-walled tubular element extending between a male end and a female end and comprising an internal tube and an external tube, arranged coaxially with respect to the internal tube so as to define a double-walled structure; each tubular element comprising an internal gap arranged between said external tube and said internal tube in which an insulating cladding is arranged, ends of two joined tubular elements comprise respective recesses (16, 17) and projections (19, 20) extending towards the other tubular element and involving only a part of the thickness of the cladding in a radial direction with respect to the tubular element so that in the joined configuration a reciprocal overlapped joint of the recesses (16,17) with the projections (19, 20) is realised between each module and an adjacent module; characterised in that the internal tube of a module terminates, at the female end, with a cone-formed end which broadens progressively towards an outside of the tube in the axial direction; the internal tube of a further module to be joined to the first internal tube terminates, at the male end, with a cone-formed end which narrows progressively towards an outside of the tube in the axial direction so as to insert internally of the female end of the first module; said cone-formed ends of the two modules to be joined substantially having a same conical angle so as to define a mechanical conjunction and a seal against fumes; one of said recesses being realised at the male end of a first module between the internal tube and a rest of the cladding in a radial direction with respect to the tubular element, and one of said projections being realised at the female end of a further module between the internal tube and a rest of the cladding of the first module joint to the further module in a radial direction with respect to the tubular element, so as to insert internally of the recess of the first module.