Filter fan with a quick fixing device

The object of this invention is to configure a filter fan in such a manner that the sucking of unfiltered air and the penetration of moisture and water into the inside of the casing of the filter fan is avoided and that moreover tight and however removable snap-in connections are obtained, even for different sheet metal thicknesses between the filter fan and the sheet metal cutout of the mounting wall, for example of a switch cupboard.

In accordance with the invention, this object is achieved by the fact that the frame is configured so as to be continuously closed all around its periphery and the brackets configured as plate-shaped blanks are molded on the frame brackets which are provided with a number of slits for constituting spring-elastic snap-in tongues.

Accordingly, the filter fan according to this invention is configured with a basic casing which is provided with quick fixing devices in form of spring-elastic preferably wing-type brackets in such a manner that the frame is configured continuously closed all around its periphery and the brackets configured as plate-shaped blanks are molded on the frame, brackets which are provided with a number of slits for constituting spring-elastic snap-in tongues.

The advantage which is achieved with the filter fan configured according to the invention consists in that the catching corners configured for the known filter fans remain unchanged with respect to their conformation and that small snap-in tongues which definitely audibly snap-in are created only by slit formations. According to the different sheet metal thicknesses of the mounting walls, the respectively corresponding snap-in tongue catches and is additionally secured for thinner sheet metal with the already pressed snap-in tongues, which is possible due to the fact that the lengths of the snap-in tongues are reduced to the outer edge area. In this manner, a safer catching of the filter fan in the cutout of a mounting wall is guaranteed independently from the sheet metal thickness of the mounting wall or from the thickness of the coat of lacquer applied on the mounting wall.

The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.