... Corrosion proof housing 4. Low noise Plastic axial evaporative air cooler, 18000CMH 1. PVC outer casing, with the feature ... voltage mute sound type nylon fan blade, big air output,low-energy consumption,low noise.3. Automatic ... control water-supply system,open type water theif,divide water fluency,automatic clearing, ... below for ref: plastic axial evaporative air cooler, 18000CMH