Abstract: A filter apparatus for filtering particulate matter from gas streams and which comprises a shaker rack suspended from a frame and supporting a plurality of filter bags and means to cause the rack to move reciprocally along a linear path wherein the shaker rack is suspended from the frame by a plurality of leaf springs which lie in parallel planes which planes are normal to the said linear path. The arrangement stops shimmying of the shaker rack during its reciprocal movement.

Abstract: Clamping means for clamping an end of a fabric filter bag to a supporting frame member comprising a U-shaped clamping member the bight portion of which forms a clamping portion lying on one side of the frame member while the arms project through apertures in the frame member, and a leaf spring engaged with the arms of the clamping member and bearing against the other side of the frame member such that the clamping portion of the clamping member is urged towards the one side of the frame member. This arrangement renders replacement or retensioning of a bag easier and prevents bag failure by reducing the stresses applied to the fibers of the bag while clamped in place.