(57) The setup comprises a succession of pipe lenghts (10), (11), (12), (13), (14), (15)
connected with each other in order to form the general structure of a fume and vapour
piping. The passage cross-sectionj of the different pipe lenghts remains aproximately
constant all along the piping and is equivalent to that of the outlet of the fume
and vapour hood or exhaust device (18). Terminal (20) which is coaxial to the outlet
and provided with a grating, includes means to facilitate during the operation of
said fume and vapour hood or exhaust device (18) a free passage of the fumes or vapours
through the outlet end of the piping. Pipe lenghts, including the bends, consist in
sensibly flattened elements one of whose walls (21) is flat and apt to rest on a flat
surface whereas at least another of their walls (22) is bulged towards the outside.
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