Environmental awareness becomes ever more important. Also for construction units with relatively small power input, the power demand adds up. Particularly in installa-tions 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.