... so water can flow smoothly and distributor is not easy to block. 6. Using highly efficient cooling pads(5090,15cm ... thickness), with large evaporation capacity, good cooling efficiency and easy to clean. Also, the cooling pads with strong ABS plastic ... noise, Comfortable, Energy-Saving, Environment-Friendly. thank you very much for your attention!!! 2013 Duct Air Cooler for Greenhouse Application