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A cover for an air vent opening in a building comprising a generally rectangular housing portion have a central panel, side and end walls, and provided with a mounting peripheral flange formed by side and end flanges extending in a plane substantially parallel with the plane of the central panel por

A cover for an air vent opening in a building comprising a generally rectangular housing portion have a central panel, side and end walls, and provided with a mounting peripheral flange formed by side and end flanges extending in a plane substantially parallel with the plane of the central panel portion of the vent enclosure part of the cover. The end flanges are provided with keyways having round portions and narrower slot portions through the end flanges along a latching surface in each of the flanges which is an inclined plane providing a flange thickness greater along the slotted than along the round portions of the keyways. The cover is held in place by screws fitting through the keyways and wedged with the latch surfaces on the end flanges of the cover by moving the cover laterally.

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A cover for an air vent in a building panel comprising: a parallelopiped shaped hollow central enclosure portion having a panel larger than said air vent and provided with end said side walls forming with said panel an enclosure larger than a louvre mounted over said air vent, and a peripheral flang

A cover for an air vent in a building panel comprising: a parallelopiped shaped hollow central enclosure portion having a panel larger than said air vent and provided with end said side walls forming with said panel an enclosure larger than a louvre mounted over said air vent, and a peripheral flange having opposite ends and opposite side portions formed integral with said enclosure portion joining said end and said side walls for fitting against said building panel around said vent opening, said end flange portions each being provided with a centrally located keyway opening having a round portion and a substantially rectangular slot portion narrower in width than said round portion, and a latch surface in each of the outer surfaces of said end flange portions, said latch surfaces being provided each on an inclined plane whereby said end flange portion is thicker along said slot portion of said keyway than along said round portion of said keyway to provide a wedging effect with a mounting screw head.