Patent ID: 8152885

Claim:
An air passage device, in particular a filter fan or outlet filter for installation in a mounting opening in a wall or in a housing of a switch cabinet, the air passage device comprising a ventilation grating and a main housing, and a filter mat insertable between the ventilation grating and the main housing, the ventilation grating being situated on the main housing using an articulated connection, wherein, in order to form the articulated connection, the ventilation grating has joint pins, each joint pin being guided in joint pin guide structures in the main housing, wherein the joint pin guide structure is implemented in the internal face inside the main housing, and wherein each joint pin guide structure connects at least one closure position, one fold-out catch position, and one removal position to one another, and wherein the joint pin guide structure comprises a path-like guide between the closure position (A) and the folded-out catch position (B) and the removal position, so that the particular positions are reachable from one another, and wherein the joint pin guide structure comprises a curved path structure so as to provide running of the joint pin in the joint pin guide structure without wedging.