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 1,800 revolutions per minute. The Deep Silence 140 mm generates an air flow of 98,3 CFM at a noise level of 20.8 dB(A). Using the 7 volt cable reduces the speed to approx. 1,100 rpm, which generates and air flow of 64.8 CFM at 12.3 dB(A).