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The 120 mm models of the Deep Silence fan series are supplied with a 7-volt adapter cable. At 12 volts this fan rotates at 1,000 revolutions per minute. The Deep Silence 120 mm generates an air flow of 55.4 CFM at a noise level of 12.8 dBA. Using the 7-volt cable reduces the speed to approx. 700 rpm, which generates an air flow of 24.8 CFM at 8.1 dBA.