The new Giesemann Aquarium Fan Cooler is made for cooling aquariums i a very effective and low cost way. The housing of these high qualitiy fan cooling system is made from stainless steel and has adjustable holders. So the Giesemann Fan cooler can be mounted over the edge of the aquarium. With the multi-level speed control of the external transformator, the output can be adjusted up to 27 m/hour.technical Data Giesemann Aquarium Fan cooling system 3 fans:-Dimensions: 310x115x30 mm-Rotor diameter: 90 mm-Housing made from stainless steel-operation with security power-multi-level speed control-low noise