Hoffman WF3LP, Weatherflo¢ Type 3R Drive Encl W/4In Fan, 29.00X24.00X12.00, Galvanized/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