Environmental awareness becomes ever more important. Also for construction units with relatively small power input, the power demand adds up. Particularly in installations with multiple fans, the envirnomental stress can considerably be reduced thanks of components with higher efficiency. The SEPA DC-fans of the new generation save considerably energy and have a significantly higher output at the same time. An output, starting from 2.1 mW per 1 liter sets new standards. The improvement was reached by new fan blades, higher motor efficiency and relatively small noise production. The SEPA DC-fans of the new generation are available ex stock in different sizes (from 15x15x8 mm to 60x60x15 mm) and in the standard voltages 5, 12 and 24 VDC.