Abstract: A radial fan with an axial housing, in particular for conveying chemically aggressive air and gases, the approximately circular cylindrical plastic housing of which has a rotationally symmetrical inlet funnel at one of its ends and an outlet funnel at its other end, and close behind the inlet funnel encloses a plastic impeller arranged coaxially with the latter, which possesses at its circumference apertures for the approximately radial discharge of the air or gases, conveyed by its curved guide blades, into the surrounding housing, the electromotor driving the impeller being situated inside a separately ventilated, plastic inner housing which penetrates the housing of the radial fan and is sealed with respect to the latter, has an electromotor carried by a support plate, which in turn is carried by four support columns, fastened to a baseplate, wherein the housing, together with the inner housing connected rigidly thereto, is connected detachably to this baseplate.