Abstract: A baghouse filter having a filter chamber separated by a partition between the clean gas side and the dirty gas side. The partition has a plurality of apertures, in each of which is mounted a filter unit for removal and replacement. The housing has an access opening to permit access to the interior of the housing and the opening is sufficiently large to permit withdrawal of the partition from the housing through the opening so as to permit replacement of the filter units exteriorly of the housing. In the present instance, the partition of the housing is mounted on a door closing the access opening, so that the displacement of the access door from the housing automatically displaces the partition from the housing to permit removal and replacement of the filter units. The filter unit assemblies permit mounting of the filter units from the dirty gas side of the partition with suitable sealing to prevent unfiltered gaseous medium from bypassing of the filter units.