The 140 mm model of the Deep Silence fan series is supplied with a 7 volt adapter cable. At 12 volts the fan rotates at 1,100 revolutions per minute. The Deep Silence 140 mm generates an air flow of 68.5 CFM at a noise level of 14.4 dB(A). Using the 7 volt cable reduces the speed to approx. 800 rpm, which generates and air flow of 52.4 CFM at 9.1 dB(A).