It describes an updraft chimney with a jacket (1), which in at least one cross-sectional plane has a stiffener in the form of radial spokes (5, 6), attack tensile strength which at one concentric to the jacket axis hub (8), an annular section (3) of the shell (1) enforce radially and are supported at this under a bias. In order to create advantageous construction conditions, it is proposed that the hub (8) forms at least two axially spaced superposed connecting rings (9) for alternately to this port rings (9) engaging spokes (5, 6).
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