Support and holding frame for air filtering elements

Claim 1

A frame for supporting and holding non-self-suppporting air filter elements for installation in wall frames or housing with or without maintainance protection having a box-like single-piece, bent frame (2) containing a flexible filter element (1) comprising: top and bottom right angular edges; the angular edges bent toward the interior (3) of the frame; centrally arranged spacers (4); the spacers protruding toward the outside along three side surfaces; two recessed front edges (5) of the frame; U-shaped sheet metal strips (6) which are open toward the front; the two recessed front edges welded to the U-shaped metal strips; square profiles (8) recessingly installed in the U-shaped sheet metal strips; coupled with bolts (7) in a hinge-like manner; ball pressure pieces (9) located on the square profiles; the ball pressure pieces having springs on both sides; a crosswise U-profile strip (10), connecting the springs; the crosswise U-profile strip having vertical legs which have a somewhat slanted side edge (11) on the outside front and back; a connecting lower angled profile (7) for rendering the front side of the frame rigid having a leg which is angled toward the bottom.