Bag filter

A filter bag for a filter system, comprising a number of parallel channels having one open end and embodied by interconnecting, along parallel assembly lines distributed over bag length, two opposite side walls of the bag, the side walls meeting at the open end;

• and a frame introduced into each channel, the frame having two substantially parallel members which extend in a plane at least substantially perpendicular to the main direction of the bag, such plane being equidistant from the two assembly lines forming the lateral boundaries of the particular channel concerned, wherein, at the bottom bag end near the bag end remote from the open end of the bag, the two substantially parallel members have lower portions which are configured to meet by way of a bottom member which is substantially perpendicular to the plane of the two substantially parallel members -- that is which extends substantially in the main direction of the bag, such that the frame as viewed perpendicularly to said plane tapers over its lower portion from a width determined by said parallel members to a substantially lesser width determined by said bottom member.