The MTC-14WG high-humidity grilles address the weakest link when using ceiling speakers in high-humidity applications, a steel grille that can rust. High-humidity grilles extend the longevity of JBL's Control 10 Series model ceiling speakers when used in such applications. The aluminum alloy material does not rust and the durable powder-coated finish prevents pitting that could otherwise occur with raw unfinished aluminum. The finish provides a nice look that matches with the speaker. The speaker upon which the grille is utilized is intended to be installed in normal ceiling speaker orientation, with the speaker mounted into a horizontal surface (and protected from the bulk of direct weather/water exposure by the overhang of the surface), with the sound projecting downward. To use the grille, simply install onto the speaker instead of the grille that comes with the speaker.