The 60 mm model of the Deep Silence fan series is supplied with a 7 volt adapter cable. At 12 volts this fan rotates at 2,000 revolutions per minute. The Deep Silence 60 mm generates an air flow of 15.8 CFM at a noise level of 12.1 dB(A). Using the 7 volt cable reduces the speed to approx. 1,200 rpm, which generates and air flow of 9.7 CFM at 6.2 dB(A).