FeaturesThis 120 mm model of the Deep Silence fan series is equipped with a 4-pin PWM connector for automatic adjustment of the fan speed. The rotary speed spectrum ranges from 650 to a maximum of 1,500 rounds per minute. The Deep Silence 120 mm PWM 1500 generates an air flow of up to 67.3 CFM at a noise level of not more than 16.9 dB(A). A set of fan shock absorbers as well as a set of fan screws is included.