... mute sound type nylon fan blade, big air output,low-energy consumption,low noise.3. Injection-moulded cabinet, pp homopolymer ... supply system,open type water theif,divide water fluency,automatic clearing,no jam. evaporative air cooler :XK-18S Voltage/frequency: 220V-240V/50HZ ... standard air conditioner takes as much as four times the energy to run than a comparable swamp cooler.That translates ...