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The three-way airflow amplifier system combines energy recovery from rotating pressure fields, progressive flow acceleration and Venturi effect volume magnification to produce strong, focused airflow Perfect in combination with the NV-FM1 swivelling multi-purpose fan mount and fans of the NF-A12x25 series (e.g. 5V PWM models with USB adapters for operation on power banks or USB power supplies) Ideal for extremely quiet table or room fans, which ensure sufficient ventilation even at low fan speeds and can therefore be operated almost silently Excellent for room ventilation applications where air should be blown as quietly as possible over longer distances or through larger spaces Easy to install with the included screws