Abstract: 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).

Abstract: A filter unit (100) includes a rigid filter block (1) that filters out a gas or particles from a gas mixture flowing through the filter unit (100). The filter block (1) has two end faces (Sf.a, Sf.e) and a shell surface (M). A housing including a pot (4) and a cover (2) surrounds the filter block (1). The pot (4) includes a base (4.1) and a tube (4.2). A gap (Sp) occurs between the tube (4.2) of the pot (4) and the shell surface (M) of the filter block (1). Between one end face (Sf.a) of the filter block (1) and the base (4.1) of the pot (4) there is a flat inner area (3.1) of a deformable damping layer (3). An outer area (3.2) of the damping layer (3) surrounds the inner area (3.1) in a circular ring form and is located in the gap (Sp).

Abstract: A filter unit (100) is configured to filter a gas and/or particles out of a gas mixture, especially out of breathing air. A process is provided for manufacturing such a filter unit. A shell surface (M) of a rigid filter (1), for example, including activated carbon, is enclosed by a flexible jacket (3). The jacket is enclosed with a rigid cover (2, 5) at the outflow-side end. The process includes inserting the filter into a shaping body, so that a gap remains between the inner wall of the shaping body and the shell surface (M) of the filter. Free-flowing material is inserted into this gap, and this material forms the jacket after a curing. A second manufacturing process includes cutting a piece off from a tube and pulling over the shell surface (M) of the filter. The piece of tube then forms the jacket of the filter.