Hazardous Location Ceiling Mount Hood, Mounting Style Ceiling, For Use With A-51 Series, Overall Width 5 1/2 in, Overall Length 12 1/4 in, Overall Height 4 1/4 in, Material Aluminum, Iron, Finish Two Coat Epoxy Clad, Standards Class I, Division 1 and 2, Groups A , B, C, D, Class I, Division 1 and 2, Groups C, D, Class II, Division 1 and 2, Groups E, F, G, Class III