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Ring Blade Design (RBD): Interconnecting fan blades designed for a reinforced and rigid structure, eliminating vibration for stable and fluid fan operation. Anti-Vibration Rubber Mounts - Patented corner mount design dampen vibration and rattling while maintaining chassis stability for silent operation. Fan Speed Cable Toggle - Built-in variable speed cable control easily adjusts fan RPM ranges for a wide versatility of cooling applications. Metal Motor Hub - Center motor hub constructed with metal for reinforced stability to deliver superior fan performance. Double Ball Bearing - Double ball bearing minimizes friction for quiet operation and exceptional lifespan.