Filter

A method for assembling a filter, comprising:

• stacking a plurality of filtering elements between a first cover and a second cover;
• connecting a transmission part to the first cover;
• coupling a cover backing to the second cover via a return system, wherein the return system is configured to return the second cover towards the first cover;
• prestressing the return system and fastening the cover backing to the transmission part;
• mounting the plurality of filtering elements in a casing such that the first cover rests against the casing in a stacking direction of the filtering elements;
• and
• at least partially detaching the cover backing from the transmission part, such that the cover backing rests against the casing in the stacking direction and that the second cover separates a zone of the casing adapted to receive filtered fluid from a zone of the casing adapted to receive fluid to filter.