ventilator, 120x120x25mm (300/900/1200, 83.2/107.5 m³/h, 10.7/17.8 dBA), Anti-Stall Knobs, AAO Frame (Advanced Acoustic Optimisation), Stepped Inlet Design, Smooth Commutation Drive 2, SSO2 Bearing, custom designed PWM IC with SCD, ultrasilentios, include 4 suruburi din cauciuc antivibratie