Filter wall for ventilation systems in buildings

Filter wall for ventilation systems in buildings, comprising: 1.1. an outer frame, which is divided into at least two frame segments (10), characterized, in that 1.2. a frame segment (10) by at least two T-shaped cross-braces (2) is formed, wherein 1.3. at least two transverse struts (2) are manufactured in one piece from a multiply folded and / or folded sheet metal and arranged crosswise, 1.4. at least two transverse struts (2) at their crossing areas (14) are executed into one another, 1.5. at each crossing region (14) has at least one of the intersecting cross members (2) has a slot (4), in which the other cross member (2) can be inserted flush, and 1.6. the intersecting cross members (2) each have at least one layer is less in the overlapping region of intersection (14), wherein further 1.7. for fixing two transverse struts (2) is provided a connecting element.