Patent ID: 9039500
Filing Date: 2015-05-26
Classification: B01D,F04D,F24F,H05K

Abstract:
1. An air passage device, particularly a filter fan or outlet filter for installation into a mounting opening in a wall, wherein the air passage device comprises a base housing and a design cover, said design cover having a frame made of four side walls, wherein the four side walls comprise an upper side wall and two lateral side walls, said lateral side walls extending perpendicularly to the upper side wall, wherein the upper side wall comprises a first wall element and a second wall element, the first wall element and the second wall element extending continuously and parallel to one another in a longitudinal direction of the upper side wall from one of the lateral side wells to an opposed other of the lateral side walls, the second wall element being disposed at a distance to the first wall element in a longitudinal direction of the lateral side walls, wherein the design cover is engaged with its side walls with the base housing, wherein a filter mat is disposed inside the design cover, wherein the design cover has a covering device constructed as a fan grid comprising sheet elements, wherein the design cover is swivellably arranged on the base housing about a horizontal or vertical swivel axis, wherein the fan grid and the base housing are locked to each other by a locking arrangement, wherein at least one sheet element is twistably arranged in the region of the upper side wall of the design cover, wherein the upper side wall of the design cover has a detent cam that protrudes at a right angle from the upper side wall of the design cover, wherein the twistably arranged sheet element is twistably arranged about a twisting axis running in the longitudinal direction of the sheet element, and is constructed as an actuating element, configured to be operated by a finger, wherein the sheet element is in operative contact with a component of the locking arrangement, wherein the sheet element is twisted by actuation of the sheet element, and wherein twisting of the sheet element disengages contact with the component and releases the locking arrangement between the fan grid and the base housing so that the design cover can be swiveled and a removal opening is accessible for removal or introduction of the filter mat for exchanging the filter mat.