Apparatus (10, 200) for the provision of TNP therapy to a wound is described, theapparatus (10, 200) including: a waste canister (22, 204) into which fluid isaspirated from a wound by aspiration pump means (44, 248) and a fluid flow path(420, 422) for at least a part of said aspirated fluid on an outlet side of said aspirationpump means (44) wherein said fluid flow path (420, 422) on the outlet side comprisesa silencing system (400) having a plurality of silencing elements (402, 404,406) therein.
