Abstract: A liquid filter immersed in a contaminated liquid, defines an open space therein receiving filtered liquid in a bottom portion thereof through a filter medium disposed thereabout, with power operated means for removing spent filter medium while fresh filter medium is supplied, and an outlet communicating with the filtered liquid maintaining a liquid level outside the frame higher than a liquid level within the frame for producing the filtering action.

Abstract: A filter section for use in a high velocity air handling assembly includes a transverse grid formed by intersecting metallic structural members defining openings accommodating the open end of a plurality of sock filters, with sealing means securing the grid about marginal portions across the assembly housing so that the grid serves as lateral bracing for the housing and as a support for the sock filters, and support means carried by the grid for the sock filters either in the form of elongated wire mesh housings or elongated rectangular open ended boxes.