Hoffman WF100LP, Weatherflo¢ Type 3R Drive Encl W/2 10In Fan, 67.00X36.00X16.00, Alum/PaintWEATHERFLO¢ Enclosures feature a forced-air ventilation system for cooling drives or other high-heat producing equipment in outdoor applications.Features:16 and 14 gauge galvanized steelLargest two sizes constructed of aluminum