Abstract: In a bag house, the flat cell plate has integral annular walls drawn outwardly from the plane of the cell plate, the walls each terminating in a lip forming a circular opening lying in a plane parallel and spaced from the plane of the cell plate. Vertical tubular filter bags are secured to the cell plate by a spring in each bag which forces an outwardly facing groove on the open end of the bag into engagement with the lip to which the bag is attached.

Abstract: A duct system wherein a main gas manifold services spaced-apart rows of bag houses and wherein a reverse-air manifold and valved passage assembly is interposed between and is connected to the main gas manifold and the bag houses. The assembly is made up of a plurality of identical modular units connected end-to-end. Each module has a portion of the reverse-air manifold therein and valved passages adapted to communicate the interior of two bag houses with either the main gas manifold for normal gas-cleaning operation or with the reverse-air manifold for bag-cleaning operations. The construction of the reverse-air manifold and valved passage modular units enables them when assembled to provide heat exchange between a hot gas being cleaned and the reverse air to avoid undesirable condensation during cleaning operations.