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Very. Permanent operation provided during a period of 185 days per year, 24 hours a day, recommended air volume stream of 15 m3/h this depends on the actual size of the room gross price of electric power: 0,159 €/ kWh January 2003, Tel.: 0180-2/660 660) the costs are only app. 3€ per year! The power consumption for two motors is only 3,8 Watt!
