Abstract: A filter having two plate-shaped cover members whose opposite major faces are formed with grooves are sealed to each other to form a chamber in which opposite surfaces of a layer of filtering material are engaged by the grooved major faces and bound the grooves. A conduit and an opening in one cover member constitute an inlet path, and an opening in the other cover member and another conduit constitute an outlet path for the fluid to be filtered and the filtered fluid respectively, both paths being transverse to the two major faces. The fluid entering the chamber is deflected at right angles from the inlet path into a direction parallel to the major faces, and the filtered fluid is correspondingly deflected into the outlet path to avoid erosion of the filtering material.