Low voltage (12V) for maximum safety when used near a wet environment. Better than overhead fans: Side-mounted fan assembly to minimize water splash on the motor and to prevent accidental immersion. Multi directional discharge nozzle for precise air flow focus. Fully adjustable, wide discharge nozzle for maximum cooling due to increased air/ water contact. Cools aquarium by one of the following methods: Direct the nozzle upwards toward the aquarium lamp fixture to dissipate some of the radiant heat generated by your aquarium lamps. Direct the nozzle so that air flows over the surface of the water. This will reduce the water temperature through increased evaporative cooling.