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The SCA1 ceiling adapter kit has two L-shaped, 26-inch (66 cm) support rails with slots in each end for mounting Spectra and DF5 Series domes in suspended ceilings or for additional support in hard ceilings. In addition to the rails, the kit includes two 7-inch (18 cm) high, galvanized, slotted side panels (Bracket B), a 10-inch by 10-inch (25.4 x 25.4 cm) mounting panel with a large hole (Bracket A), and mounting hardware.