Abstract: A filter system for large containers, in particular, silos, with a hollow section containing at least one filter and having an air inlet opening connectable with the large container and an air outlet opening in communication with the filter is disclosed. The filter is insertable into the air outlet opening and is supported by a filter flange on the edge of the air outlet opening. The end of the hollow section having the air outlet opening is covered by a dome connected to the hollow section such that it is movable between an open and closed position.