What is it? It\'s a replacement air filter for the portable air cooling units, USB Desktop Cooling Fan and USB Portable Air Cooler! About the product Epic cooling technology lasts for even longer with this replaceable filter. Simply replace the old with the new and continue to enjoy all the cooling benefits. Why you should buy it Keep your cooling unit fresh and ready for action. Order a replacement filter for your desktop cooling fan now! | Replacement Filter for Air Cooling Unit