The hose-proof hood for increasing the protection class is a protective cover for filter fans, intake  and exit filters, e.g. for the series FPI 018, FPO 018 and FF 018. It is used for protection against water projected by a hose and extreme climatic influences if located outdoors or in industrial applications with harsh environmental conditions. In order to clean the filter fans or to change the filter mat, the hood can easily be removed, the cabinet does not need to be opened (safety risk).