The 140 mm models of the Deep Silence fan series are supplied with a 7 volt adapter cable. At 12 volts the fan rotates at 1,400 revolutions per minute. The Deep Silence 140 mm generates an air flow of 76.5 CFM at a noise level of 16.2 dB(A). Using the 7 volt cable reduces the speed to approx. 900 rpm, which generates and air flow of 60.1 CFM at 10.5 dB(A).