A filter unit (100) is configured to filter out particles from a gas mixture flowing through filter unit (100). A process of manufacturing the filter unit (100) is also provided. A particle filter (1) is arranged in a housing (2, 4). The particle filter (1) has a larger end face (Sf.e), a smaller end face (Sf.a) and a lateral surface (M) between the two end faces (Sf.e, Sf.a). A circumferential gap (Sp) is formed between the lateral surface (M) and the housing (2, 4), which tapers towards the larger end face (Sf.e). To produce the filter unit (100), the particle filter (1) is inserted into a housing part (2), and a sealing compound is filled into the tapering gap (Sp). The sealing compound hardens and forms a sealing element (9).