[. . . ] It is therefore recommended for new construction or major remodels only. [. . . ] To accommodate correct speaker orientation, the S1M can be installed horizontally or vertically. For vertical installation, the snap on wings (a) must be used (see Fig. In horizontal installation, if cross braces are available above & below the speaker location, the snap-on wings (see (a) in Fig. Pre-routed wire can be held in place using the molded wire tabs (c) on the back side of the frame unit. Be sure that no wire remains exposed on the front (wall board) side of the assembly. Note: In order to facilitate correct wall board installation, the raised inner lip of the roughin-frame (d) serves as a physical barrier that the wall board edge should rest against. [. . . ] Note: In order to facilitate correct wall board installation, the raised inner lip of the roughin-frame (d) serves as a physical barrier that the wall board edge should rest against. [. . . ]