Air-directing device for free-blowing fans

摘要

The invention relates to fans having a free-blowing radial or diagonal impeller, in particular for use as a roof fan or installation fan. An air-directing device for free-blowing fans with a radial or diagonal impeller is designed, according to the invention, as a fixedly installed, rigid air-directing device, which generates a negative initial swirl and through which flow takes place predominantly axially, and is arranged in front of the impeller. <IMAGE>