Filter assembly with a double sealing lip

A filter assembly, comprising:

• a retention frame with an end face;
• an accordion fold pack with an end-face fold, the fold pack being made of filter material, the fold pack sealingly joined to the retention frame;
• a bracing located on at least one side of the retention frame extending essentially parallel to the direction of an end-face fold edge of the accordion fold pack, the length of the bracing being essentially equal to the length of the end face fold of the accordion fold pack, the bracing being arranged within the end-face fold;
• a double sealing lip, comprising a first sealing lip and a second sealing lip, disposed at the end face of the retention frame, the double sealing lip extending essentially parallel to the bracing in the direction of the end-face fold edge;
• and
• a hinge joint swivelly attaching the double sealing lip to an end face of the retention frame, so that the double sealing lip, can be sealingly positioned with the first sealing lip against an end-face fold wall, and with the second sealing lip against a boundary wall of a filter housing that faces the end-face fold wall.