Plastic Grille Box | Diffuser Box Our plastic grille box is manufactured using recycled high impact resistant black plastic. Easier and lighter to work with than steel grille boxes. Multi spigot gives three different sizes. Spigots are easy to cut to size. 20mm Flange Use the 460 x 460mm boxes with a ceiling tile replacement 4 way ceiling diffuser. Use the 550 x 550mm boxes with a ceiling tile replacement egg crate grille. [table “2” not found /]
