Zoo Med’s Aqua Cool is a great way to keep your aquarium cool. Fully adjustable side-mounting Aquarium Cooling Fan. Low voltage (12 v) 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.