How do the louvers attach to the grille?
Louvers do not attach directly to the grille. All louvers tension fit into your opening and come with a foam outer strip to prevent damage and ensure fit. You just push the louver into the boot of the duct and place the grille on top. The grille will sit on top of the opening but not connect to the louver. A key is included that fits through the face of the grille and allows flow adjustments.
