Abstract: A guide vane arrangement for axial fans, intended to translate the rotational component of the gas flow velocity after passage through the impeller (1) into a substantially axial velocity, including a ring (2) of guide vanes disposed downstream of the fan and in spaced relationship therewith. Alternate guide vanes are axially displaced with respect to the remaining ones, so that alternate guide vanes are at a first axial distance from the fan and the remainder are at a second axial distance from the fan. As an alternative, alternate guide vanes have a portion of the end part facing towards the fan removed, so that the forward edge of alternate guide vanes is at a first distance from the fan and the remaining guide vanes are at a second axial distance, and the guide vanes are non-uniformly distributed along the periphery of the ring.