An ostomy appliance comprising an adhesive face plate comprising an adhesive layer 2, a release sheet 3 and a carrier sheet 4 attached to a coupling ring 6 by means of a plastic film strip 9 forming a filter pouch together with a film strip 12 having a flatus gas venting aperture 18 covered by a filter 17, the filter pouch 9, 12 communicating through an aperture 20 in the film 9 with the interior of an ostomy bag 6b attached to the face plate by means of a coupling ring 6a engaging the coupling ring 6, an intermediate film 21 subdividing the filter pouch 9, 12 into two compartments 22 and 23 in flow communication through an aperture 24 in the film 21, the filter 17 being located in the compartment 23 such flatus gas flows from the interior of the bag 6b through aperture 20 into compartment 22, through aperture 24 into compartment 23, through filter 17 and out through aperture 18.
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