The 120 mm models of the Deep Silence fan series are supplied with a 7 volt adapter cable. At 12 volts the fan rotates at 1,800 revolutions per minute. The Deep Silence 120 mm generates an air flow of 72.1 CFM at a noise level of 19.9 dB(A). Using the 7 volt cable reduces the speed to approx. 1,100 rpm, which generates and air flow of 34,7 CFM at 12,2 dB(A).