Premium quiet fan 80x80x25 mm 12V 4-pin PWM max. 2200 RPM max. 17.7 dB (A) >150 000 h MTTFAward-winning 80x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance8cm format is ideal for compact PC cases (HTPC ITX Small Form Factor) and other chassis (intake & exhaust) replacement fan for NAS and other devices etc. 4-pin PWM version for automatic speed control via 4-pin PWM fan headers broad 450-2200rpm speed range (1750rpm max. with supplied Low-Noise Adaptor)Includes anti-vibration mounts fan screws Low-Noise Adaptor extension cable and y-cable for running two PWM fans on the same header