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.