Abstract: A ceiling louver assembly is constructed from a plurality of ceiling units each having four ceiling tiles with each ceiling tile having identical projecting side tabs disposed in coplanar abutting relation with side tabs of adjacent tiles. A metal strap is disposed in overlying relation with respect to the coplanar abutting side tabs of adjacent tiles and secured thereto by means of screws in blind bores. Each ceiling tile is provided with a projecting corner tab at each corner and a hanger is disposed in engagement with the four projecting corner tabs of four adjacent units. The hanger is comprised of a base plate underlying the corner tabs with upstanding flanges disposed between adjacent units to prevent lateral movement of the corner tabs relative to each other.