113 and the partition 103 the spacing between the components 123 and 124 is selected to correspond to the thickness of the marginal portion of the opening 113 so as to releasably anchor the filter bag 109 in place within the opening 113 of the partition 103 the filter fabric making up the tube 112 and the components of the composite fabric 118 must be of heat resistant material in order to avoid deterioration when subjected to the hot gases which pass through the filter casing bag filters of this type are frequently used to treat the drying medium in dryers and in such installations the temperature of the gaseous medium to be filtered may be substantially greater than the degradation temperature of normal textile material of course where the gaseous medium being filtered is not subject to high temperature limitations the textile components of the bag elements may be comprised of standard textile materials in any event the use of a composite fabric with a plain annular metallic wall of spring steel such as shown in fig3 permits the fabrication of the filter elements in a simple and highly economical fashion and permits the selection of the textile materials which resist the adverse effects of the particular gaseous medium and the entrained foreign matter which is being filtered in bag filters of this character there is frequently a problem which arises due to the generation of static electricity charges on the bag which if not dissipated may create danger.