Rockville RRF4 19" Rack Mount 4 Fan Cooling System with LED Temperature Display Rockville RRF4 Rack Mount Cooling System with Temperature Display. Four High Velocity 80mm ball bearing case fans. Three digit blue display screen shows the inner temperature of cabinet or multimedia center. Power 110v / 60hz. Includes rack installation screws. Dimensions: 19&quot; x 4.3&quot;. Weight: 3.5 lbs.