All the same advantages of a standard HyperFan V2 but without the noise Rated at 70% less noise than standard versions Advanced engineering over competing brands Spring mounted motors and dB specific foam Detachable speed controller is included and connects/disconnects easily Dual sleeve collar for universal fitting 0-10V controller compatible Compatible with Gavita ELF (GEN-2) master controllers (sold separately) Compatible with Climate Control V2 (sold separately) SILENCED PHRESH HYPER FAN COMMON FEATURES: 2 Year Warranty EC digital brushless motors are quieter, operate at lower temperatures, energy efficient & reliable. High Pressure Laminar Air Flow/Taper Blade & Stator Technology Multi-phase Technology Soft Start Technology Heavy Duty Sealed Bearings for smooth operation